I've tried to find the maximum current that the nexus will draw, without any luck.
some people have said that the galaxy s 2 draws a max of 1A because the phone itself says 1A, but thats wrong, as it says 1A on 3.7v, clearly talking about the input the phone draws from the battery... not the charging circuit... other people say the galaxy s2 limits current to 650mA for heat/safety reasons... I have no reason to believe or disbelieve this.
Getting back to my question, what's the max current that the charging circuit will take, I know the AC/DC adapter that came with my gsm gnexus is 1A/5V, but that may be more than enough, or not as much as the nexus could handle.
I ask because there are many 5v ac/dc converters that output more than 1A, some over 2A... would the nexus charge faster with this much current, and would it be good/bad for the battery?
this could be easily tested if someone has access to an EE LAB, giving the phone 5v, and seeing how much current it takes... would need a DC volt supply capable of >10W (5v/2A).
8steve8 said:
I've tried to find the maximum current that the nexus will draw, without any luck.
some people have said that the galaxy s 2 draws a max of 1A because the phone itself says 1A, but thats wrong, as it says 1A on 3.7v, clearly talking about the input the phone draws from the battery... not the charging circuit... other people say the galaxy s2 limits current to 650mA for heat/safety reasons... I have no reason to believe or disbelieve this.
Getting back to my question, what's the max current that the charging circuit will take, I know the AC/DC adapter that came with my gsm gnexus is 1A/5V, but that may be more than enough, or not as much as the nexus could handle.
I ask because there are many 5v ac/dc converters that output more than 1A, some over 2A... would the nexus charge faster with this much current, and would it be good/bad for the battery?
this could be easily tested if someone has access to an EE LAB, giving the phone 5v, and seeing how much current it takes... would need a DC volt supply capable of >10W (5v/2A).
Click to expand...
Click to collapse
I dont know the answer to your question but my nexus eats amperage like it is going out of style. I can charge from almost empty to full in about 90 minutes.
Sent from my Galaxy Nexus using xda premium
@rbiter said:
I dont know the answer to your question but my nexus eats amperage like it is going out of style. I can charge from almost empty to full in about 90 minutes.
Sent from my Galaxy Nexus using xda premium
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Click to collapse
Given the battery is 1850 mAh you are drawing a minimum of 1.85Ah/1.5h = 1.233 amps. Since your battery wasn't completely dead, you are drawing slighlty more.
But was the limit the Galaxy Nexus, or the charger? Also, if one were to use navigation or other power hog while in the car, the current draw should be greater without only some of that going to charge the battery.
[email protected] said:
Given the battery is 1850 mAh you are drawing a minimum of 1.85Ah/1.5h = 1.233 amps. Since your battery wasn't completely dead, you are drawing slighlty more.
But was the limit the Galaxy Nexus, or the charger? Also, if one were to use navigation or other power hog while in the car, the current draw should be greater without only some of that going to charge the battery.
Click to expand...
Click to collapse
if he has the GSM galaxy nexus, the battery is 1750 mah, and assuming his device was off or idle during this time, then the current you calculate is not a minimum, it's a maximum... if the battery was half full to start, then 90 minutes were spent charging half of the capacity, so the current was actually half of the amount you calculated.
to answer this question someone needs a nearly empty battery in a galaxy nexus, with the device off (just to be sure we are only measuring charging current, although most likely it is circuit limited, and not battery limited, so it probably wouldn't matter)...
Then they should try charging it with a 5V DC power source with unlimited current, with a way to monitor the current.
most charging circuits for these type of batteries are current limited, then voltage limited, so the battery must be close to empty so we are sure we are monitoring max current... the latter part of the charge is voltage limited and in the end is very small amounts of current.
I am getting a new usb 2.0 hub soon. I didnt know there was a bc 1.1 compliant device standard, aka battery charging 1.1, that allows charging at 1.5amps. But i think this applies to powered hubs, since usb 2.0 technically only allows 500ma, and of course charging from a computer will only allow 500ma. Samsung recent smartphones allow this type of charging, so im sure nexus can utilize it. And yes, sgs2 was limited to 650mah charging for some reason. I never followed up on if devs overcame the limitation. The sgs2 crowd turned me off from the device because of their elitist attitudes.
Crazy world, ay?
@rbiter said:
I am getting a new usb 2.0 hub soon. I didnt know there was a bc 1.1 compliant device standard, aka battery charging 1.1, that allows charging at 1.5amps. But i think this applies to powered hubs, since usb 2.0 technically only allows 500ma, and of course charging from a computer will only allow 500ma. Samsung recent smartphones allow this type of charging, so im sure nexus can utilize it. And yes, sgs2 was limited to 650mah charging for some reason. I never followed up on if devs overcame the limitation. The sgs2 crowd turned me off from the device because of their elitist attitudes.
Crazy world, ay?
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Click to collapse
yeah I'm trying to buy the best ac adaptor for my nexus, but finding info is difficult.. the one that came with my nexus is for europe, and is 5v/1A, but it may not be the optimal current. The market seems to have many adapters capable of 0.5A, 750mA, 850mA, 1A, and 2.1A (marketed for ipad)...
will the nexus benefit from a 2.1A ac/adapter even if it doesn't 'need' it?
The Nexus charger is rated at 1 amp. I'm using my Captivate charger at work, which is rated at .7 amps. I'm thinking just because the Nexus charger is rated at 1 amp, that doesn't meant the Nexus is actually drawing that much power. Anyway, the Captivate charger I have seems to work fine.
Any issues here?
8steve8 said:
yeah I'm trying to buy the best ac adaptor for my nexus, but finding info is difficult.. the one that came with my nexus is for europe, and is 5v/1A, but it may not be the optimal current. The market seems to have many adapters capable of 0.5A, 750mA, 850mA, 1A, and 2.1A (marketed for ipad)...
will the nexus benefit from a 2.1A ac/adapter even if it doesn't 'need' it?
Click to expand...
Click to collapse
Just get a 1amp charger. It is plenty, on the safe side and fast fast fast for the nexus. With a 1a Motorola charger I have it charges 1% a minute when I am not using phone. I got that powered hub yesterday. Charging the nexus off of it was about 1.5% a minute and I didn't see battery go above 33 degrees Celsius.
Sent from my Galaxy Nexus using xda premium
let me clarify that im not worried about what will "work" im looking for what's the ideal charger...
yes 0.7A will charge it, so will 1A, but the actual max current draw is still what I'm asking.
http://www.reddit.com/r/GalaxyNexus/comments/nvgt4/chargers_3000ma_worth_the_risk/c3cb636
http://www.reddit.com/r/Android/comments/nystt/galaxy_nexus_power_analysis_why_chargers_cant/
I measured the charging current at just less than 0.5A with the phone on and off. I too was thinking that a higher capacity charger would speed charging.
1 amp chargers are more than adequate. I did this check with the battery at 80%.
طوني تبولة said:
http://www.reddit.com/r/GalaxyNexus/comments/nvgt4/chargers_3000ma_worth_the_risk/c3cb636
http://www.reddit.com/r/Android/comments/nystt/galaxy_nexus_power_analysis_why_chargers_cant/
Click to expand...
Click to collapse
Thanks for these threads. I was curious, too, if it does any good or harm to my GN if I plug it into the 2.1A plug of my power bank.
not that i care if i break too but if there some way where i can use my 2.1 amp wall charger to fast charge my phone and use 2.1 amps rather than 1 a
Related
So i just sold my old blackberry curve and along with it the wall charger i used for my MT4g
so i looked around my house for another corded wall charger as the plug-usb cable combo just doesnt work for me as the cord is way too short for my needs
well i found an older Moto wall charge PN# SPN5334A...it has the same basic specs are the mytouch plug part with the Input: 100-240~200mA 50-60Hz...but the output is 5v 550mA instead of the mytouch plug being 5v 1A
so the question is...will the different of almost a half an amp cause any serious issues other than maybe a slower charge? any potential for damage to the battery or phone or even the charger?
well any help would be great...thanks
No it wont hurt the phone, only way to damage it is to over amp, as in say it was 2.5 amps but however it will slow the charge down I recommened going to a a store that sells computer stuff and picking up a usb extension cord I got a 3 foot on mine and dont see any draw backs as I do with a under amped charger
f1vel66a said:
No it wont hurt the phone, only way to damage it is to over amp, as in say it was 2.5 amps but however it will slow the charge down I recommened going to a a store that sells computer stuff and picking up a usb extension cord I got a 3 foot on mine and dont see any draw backs as I do with a under amped charger
Click to expand...
Click to collapse
yeah i never really considered extending the usb cable...i actually have a 6 ft extension cable sitting in my drawer
but i appreciate the info
No problem hope it helped
Sent from my HTC Glacier using XDA App
f1vel66a said:
No it wont hurt the phone, only way to damage it is to over amp, as in say it was 2.5 amps but however it will slow the charge down I recommened going to a a store that sells computer stuff and picking up a usb extension cord I got a 3 foot on mine and dont see any draw backs as I do with a under amped charger
Click to expand...
Click to collapse
What's over amp? If the voltage is correct, the higher the amperage the more efficient it(charger) is, as the phone will draw as much as it needs to charge, in this case around 1amp according the factory charger.
Matching voltage is the important part. Too low of amperage will result in slower charge or no charge when using and plugged in at the same time.
[via XDA premium]
sleepyfu said:
What's over amp? If the voltage is correct, the higher the amperage the more efficient it(charger) is, as the phone will draw as much as it needs to charge, in this case around 1amp according the factory charger.
Matching voltage is the important part. Too low of amperage will result in slower charge or no charge when using and plugged in at the same time.
[via XDA premium]
Click to expand...
Click to collapse
All voltage is the force pushing the amps through. Amps is the actual energy. Resistance is a factor too. Check the Watts to see that they match. But don't over amp it as well
Sent from my HTC Glacier using XDA Premium App
I meant there is no such thing as over amp. Amprage rating is for how stout the power supply is. A 5v/2amp supply can charge 2 of these phone with out issues. 500mA will charge but slow. Think of car batteries they are all 12v and the "long lasting" or "performance " ones will have better amp ratings.
Wattage is simply volt x amp, in this case here, volt is the constant.
[via XDA premium]
sleepyfu said:
I meant there is no such thing as over amp. Amprage rating is for how stout the power supply is. A 5v/2amp supply can charge 2 of these phone with out issues. 500mA will charge but slow. Think of car batteries they are all 12v and the "long lasting" or "performance " ones will have better amp ratings.
Wattage is simply volt x amp, in this case here, volt is the constant.
[via XDA premium]
Click to expand...
Click to collapse
If by over amp, you mean over charge? Too much amperage causes a lot of problems, just like too much voltage can cause a lot of priblems
Sent from my HTC Glacier using XDA Premium App
sleepyfu said:
I meant there is no such thing as over amp. Amprage rating is for how stout the power supply is. A 5v/2amp supply can charge 2 of these phone with out issues. 500mA will charge but slow. Think of car batteries they are all 12v and the "long lasting" or "performance " ones will have better amp ratings.
Wattage is simply volt x amp, in this case here, volt is the constant.
[via XDA premium]
Click to expand...
Click to collapse
I've seen phone batterys blow from to much amps... You can go + .5 amps max on a cell phone before things start to go wrong. And that isnt recommended for to long unless you want battery issues
Sent from my HTC Glacier
So did it happen with a 5volt output charger or something higher? I have seen 8v mini usb charger from Motorola around, that will blow out your HTC battery.
Also can happen if there is a problem with the phones charging circuit, not from a 5v charger with a high amperage rating. Now with a higher amp rating, and your phone has issues, the more amps is available, the bigger "battery blow" you can achieve.
Do I recommend more than 5v/1amp? not really, but can you use a 5v/2amp charger or a 5v/4amp charger if it exists? Yes. Is 1amp safer? kinda.
How do I know this? it was an amperage question I answered wrong at my every 1st job interview 11 years ago.
These guys put it in better words than I do.
sivankls said:
DOESN'T MATTER ..if u know the basic Ohms Law..its the max capacity of the charger.(or any source) the current regulating circuits will take care of the real charging current fed to the battery
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Click to collapse
tkteun said:
I charge my phone on my computers USB connection all the time, all computers have a maximum of 500mA USB current.
Amps are pulled from the charger, not pushed to the phone.
Voltages are pushed to the phone, not pulled from the charger.
If the phone draws too much current from the charger, the voltage drops to a point where the maximum power (P (Watt) = U (Voltage) * I (Amps)) of the charger isn't exceeded.
According to the USB specification you need at least 200mA with 500mA recommended +5VDC.
More is never a problem, you could even use a 50A power supply without breaking your phone. Practically spoken: I wouldn't do that.
Click to expand...
Click to collapse
Hi All,
Was wondering if anyone knows the maximum current the SGS2 can draw for charging purposes. I had a look at the wall charger provided with it, and it's 0.7a; it takes forever (my opinion) to charge compared to my last phone. Just wondering if it is worth my while investing in a more powerful charger.
Cheers
If you take the battery out and look and the sticker then it says there 1000mA
Excellent thanks; Can't get the back off my phone (fingernails).
oozrafa said:
If you take the battery out and look and the sticker then it says there 1000mA
Click to expand...
Click to collapse
Also, at the start of the SGS2 charging cycle, my wall-plug power meter reads 5.1 W.
5.1 is what the adapter is pulling. All of that isn't getting to the phone. Funny thing for my is the phone charges faster off my blackberry 0.75a charger then it does off my Galaxy I 1a charger.
Sent from my GT-I9100 using XDA Premium App
Someone in another thread mentioned seeing something in the source code about the phone drawing at most 650 mA (instead of a more typical 1000 mA) during charging. If that's the case, a more powerful charger by itself won't help; you'd also need a custom ROM that doesn't limit the charge current.
Does anyone know why Samsung would limit the charge current?
theinstagator said:
Does anyone know why Samsung would limit the charge current?
Click to expand...
Click to collapse
Speculation is that its a heat related problem. Don't want to pull a Sony and have the batteries explode on people... (but again, that's speculation)
Murfle said:
Speculation is that its a heat related problem. Don't want to pull a Sony and have the batteries explode on people... (but again, that's speculation)
Click to expand...
Click to collapse
I also heard that a smaller charging current extends the Li-ion battery's lifetime, even though I'd prefer quicker charging as the battery can be replaced with ease.
I second that. I tried it today with a 1A car charger (USB cig. plug) can't say it made a difference on speed of charge compared to wall one.
Just received my SGSII and the charging is extremely slow. 3+ hours = about 500 mAh, on a 1A wall charger. Never had such a slow charging smartphone before
To change i9100 charging current you have to short r529 or r531
Current limit will change to 1000mA
You can use 2A charger and phone will charge only with 650mA current
But after this short one of those resistors current limit will change to 1A
I use it on my phone and all is fine. Current after change is measured.
Wath this film youtube.com/watch?v=FL71G2YEIHU
Make shortcut of resistor and check your new current and feel the difference.
Is there a logfile, where I can see which charge current is used?
I have the suspicion, that my noname charger is not recognized properly and it only charges with USB current (450mA).
hmm a 1000mA current could be used also for the 2000mAh battery?
Yes, should not depend on the capacity of the battery.
Sent from my GT-I9100 using xda app-developers app
good
thank for all, it help me so much
1000mA is more likely the maximum current that the phone is expected to drain from the battery.
It is not the battery charging current, which is presumably equal to the mentioned 650mA, since the 1650mAh battery charges in about 4 hours.
If the charging current was actually 1000mA, then the 1650mA battery it would charge in 2 hours or so, but as we all know, it is not so, even with a 2A charger.
mine took about 4 hours charge the battery
The charging time depends on the Charger and Rom i use, i havent figured out for what reason.
Sometimes the SGS2 is charged in approx. 1 hour and with other Roms the charging time may take up to 3h.
kirschi said:
The charging time depends on the Charger and Rom i use, i havent figured out for what reason.
Sometimes the SGS2 is charged in approx. 1 hour and with other Roms the charging time may take up to 3h.
Click to expand...
Click to collapse
Definately 650ma, IF the phone detects an High current USB port, otherwise it falls back to lousy 400ma.
You can trick into 650ma always: take a usb cable, cut from the PC plug side the TX/RX cables, on the other side short them on PHONE plug side these two cables.
Phone will now always go into "AC charging mode". Don't worry (too much) for your USB ports, they can all well 1000ma, and the one that cannot will report "high current detected, port disable".
:fingers-crossed:
I see that the wall charger for the Galaxy Nexus outputs 5V and 1A. Unfortunately, none of the extra chargers I'd like to use as additional chargers have this output. Some of them are 5.1V, and some of them all put out under 1A.
From what I understand, using a charger w/ a higher voltage could potentially damage the phone. I know that this unlikely considering it's only an extra .1V in my case, but I don't want to risk it.
As for the amps, I believe that using lower amps isn't dangerous, but may result in charging taking longer than normal.
Are these two assumptions correct? Also, does anyone know of any cheap chargers that put out 5V/1A? If you put in "phone charger" in Amazon, the second hit is a Samsung OEM charger that puts out 5V/0.7A, but I'd rather get one that is going to be an exact match.
700-800mah are fine and acceptable for charging. But if wanting to play games on a charger and still get some kind of charge, go with a 1000 mah charger. 1000 mah charger is also best to use while using mhl so you can hopefully not lose battery charge while streaming video over hdmi.
Sent from my samsung gt i9250 which is in the wrong country.
Speaking of the charger... anyone found a cheap charger adapter for the Nexus? I don't like the massive brick of a "international adapter" Handtec packaged with the phone >.>
Dmw017 said:
Speaking of the charger... anyone found a cheap charger adapter for the Nexus? I don't like the massive brick of a "international adapter" Handtec packaged with the phone >.>
Click to expand...
Click to collapse
http://www.amazon.com/Samsung-Micro-Travel-Charger-M540/dp/B002HJBM04
http://www.amazon.com/Samsung-Travel-Charger-Adapter-MicroUSB/dp/B0049IE70I
Dmw017 said:
Speaking of the charger... anyone found a cheap charger adapter for the Nexus? I don't like the massive brick of a "international adapter" Handtec packaged with the phone >.>
Click to expand...
Click to collapse
I'm using a Griffin charger for the iPhone (1 amp)... it's very small and the plug blades fold up, making it very pocketable. Give the included iPhone cable to a friend.
http://www.amazon.com/Griffin-NA231...?s=electronics&ie=UTF8&qid=1322795627&sr=1-33
alee said:
I'm using a Griffin charger for the iPhone (1 amp)... it's very small and the plug blades fold up, making it very pocketable. Give the included iPhone cable to a friend.
http://www.amazon.com/Griffin-NA231...?s=electronics&ie=UTF8&qid=1322795627&sr=1-33
Click to expand...
Click to collapse
it's.. 24 bucks ... for a charger..
lol fml
Dmw017 said:
it's.. 24 bucks ... for a charger..
lol fml
Click to expand...
Click to collapse
Haha, it's a nice charger.
If you don't get that one, do get a charger that does at least 700mA... or ideally 1A. Some of the cheaper chargers don't put out a lot of power and it will take a long time to charge your phone.
alee said:
Haha, it's a nice charger.
If you don't get that one, do get a charger that does at least 700mA... or ideally 1A. Some of the cheaper chargers don't put out a lot of power and it will take a long time to charge your phone.
Click to expand...
Click to collapse
...you say it folds too huh :/ ....
but for that price, i wonder if there are any samsung chargers that are just as good if not better..
that is Apple, after all
hey isnt http://www.amazon.com/Griffin-Techn...al-USB-Charging/dp/B004EYH5WY/ref=pd_sim_e_10 the same product , it says it does 5 volts at 5 watts ... thats the same right?
edit: some people are reporting that the charger only charges at 0.5A instead of the full 1A on [some] android devices. if you have the charger, can you confirm your nexus charges at the full 1A watts
I've been doing fine with just plugging it into my computer like I always do with every other phone.
Sent from my Galaxy Nexus using xda premium
Dmw017 said:
hey isnt http://www.amazon.com/Griffin-Techn...al-USB-Charging/dp/B004EYH5WY/ref=pd_sim_e_10 the same product , it says it does 5 volts at 5 watts ... thats the same right?
edit: some people are reporting that the charger only charges at 0.5A instead of the full 1A on [some] android devices. if you have the charger, can you confirm your nexus charges at the full 1A watts
Click to expand...
Click to collapse
Same one.
Good question on whether it's putting out a full 1A. I guess what I do is check the charge times tomorrow with a few different 1A chargers to see if it measures up.
I use this for home:
http://www.amazon.com/Cellet-Charger-Retractable-Cable-myTouch/dp/B004XVM1T0
And this for the car:
http://www.amazon.com/Griffin-Powerjolt-Dual-Universal-Micro/dp/B0042B9U8Q
Both are dual-USB and put out 1amp. Charges my GNEX and iPhone 4 (work) at the same time without issues.
Just feel like to chime in here for another question.
I know typical USB port from a PC outputs 0.5A while the wall charger outputs 1A, so besides charging time, is there any particular advantages to use wall charger over USB from PC?
I've read somewhere else states that despite the longer charging time using a USB port from a PC, it provides more thorough charges hence is better for the battery than using a wall charger, is this true?
Thanks!
assisterah said:
Just feel like to chime in here for another question.
I know typical USB port from a PC outputs 0.5A while the wall charger outputs 1A, so besides charging time, is there any particular advantages to use wall charger over USB from PC?
I've read somewhere else states that despite the longer charging time using a USB port from a PC, it provides more thorough charges hence is better for the battery than using a wall charger, is this true?
Thanks!
Click to expand...
Click to collapse
I've read that the wall charger drops the battery down to 90ish % after it hits 100% and just goes between the two levels until you unplug your charger
While a USB charge is slower and charges your device up to a "fuller" charge
...I may be unfathomably wrong though
---------- Post added at 10:57 PM ---------- Previous post was at 10:56 PM ----------
man that little Apple charger is so damn cute ... lol , ill probably end up buying it once the 1A volt charge is confirmed
edit: just bought it lol, oh well.. it will probably maybe more or less somewhat possibly work like it should at 1A :}
assisterah said:
Just feel like to chime in here for another question.
I know typical USB port from a PC outputs 0.5A while the wall charger outputs 1A, so besides charging time, is there any particular advantages to use wall charger over USB from PC?
I've read somewhere else states that despite the longer charging time using a USB port from a PC, it provides more thorough charges hence is better for the battery than using a wall charger, is this true?
Thanks!
Click to expand...
Click to collapse
I'm not an expert on the subject but I was under the impression that cycles (charge + discharge) were a bigger factor on battery life than something like this. The longer a current is running through the battery (charge or discharge) is detrimental to it's life span.
Leaving a laptop plugged in all the time ruins its battery is my source on this one. I would say it's because it has a constant charge running through the battery.
qreffie said:
I've been doing fine with just plugging it into my computer like I always do with every other phone.
Sent from my Galaxy Nexus using xda premium
Click to expand...
Click to collapse
That takes a lot longer vs plugging it into the wall
rashad1 said:
That takes a lot longer vs plugging it into the wall
Click to expand...
Click to collapse
True dat. Unless it has changed , USB only outputs 500mA.
Sent from my Galaxy Nexus using Tapatalk
[hfm] said:
True dat. Unless it has changed , USB only outputs 500mA.
Sent from my Galaxy Nexus using Tapatalk
Click to expand...
Click to collapse
500mA is the max before the PC will disable the port. So your actually get less current.
There are some ports, depending on the motherboard that have a option of outputting more power for charging devices, and also have the port powered when the computer is off. But a normal usb 2.0 port is limited to 500mA max per spec... so a normal usb 2.0 port charging a phone is drawing less then 500mA, or it would get and over current condition and disable the port.
I design electronics and work with USB and batteries often, so let me clear some stuff up in no particular order:
- PC ports are limited to 500mA so will only ever output a max of 500mA
- You can use a wall charger that outputs 1000mA but on most devices the data pins on the micro USB need to be shorted to tell the phone it can try to draw more than 500mA. This is true for HTC devices for example. That means if you get a cheap charger that doesn't short the data pins, when you plug your standard micro-usb cable into it, it will still only charge your phone at 500mA.
- The charging controller is actually in the phone. It decides based on temperature (there's a sensor in the battery), current, voltage across the battery (current charge) and characteristics of the type of battery to figure out how much current to allow into the battery. Although its true that a 500mA charger may have different affects than 1000mA chargers, there usually is very little perceivable difference. Which is (slightly) better really depends on the charging controller and how it decides when to stop charging.
- When the battery is full, the phone continues to 'trickle charge' for a period of time. This isn't a bad thing. Overcharging a Lithium battery can be extremely dangerous, so normal charging occurs at a high speed and then slows down at a safe limit below the 'true' 100%. After that the phone continues to trickle charge to top up the battery. This is the reason you read in phone manuals you should charge the phone for 8 hours or overnight for its first charge.
- When charging at 500mA, the battery does not get as hot. This usually means you get closer to the true 100% before 'trickle charging' starts. With a 1000mA charge the battery heats up a lot more so charging may switch to trickle much sooner. Here's an example with made up figures.
Lets say you charge your battery with a 500mA charger, and it takes 2 hours. When the phone shows 100% it may actually be at 99%, and trickle charging. Leaving it for another 30 mins may take it to its full capacity.
Now, lets say you charge your battery with a 1000mA charger, and it takes 1 hour. When the phone shows 100% it may actually be at 98%, and trickle charging - It stopped sooner because the battery was hotter. Leaving it for another 30 mins may take it to full capacity.
Conclusion.. the 500mA charger took 2.5 hours, while the 1000mA charger took 1.5 hours. However if you unplugged both when the phone showed 100%, the 500mA charged battery may last longer, and so you think the 500mA somehow resulted in a more thorough charge!
At the end of the day, it doesn't matter which you use. the absolute charge cycles is what counts. Charge to 100%, then dont charge till its 0 for best battery care. Constantly plugging into a charger or dock all day on and off is bad. But having said that, your phone is there to be used, so a sensible balance of the two is the best bet.
Thank you so much for the detailed response, kam187. Would you recommend avoiding using a 5.1V charger, considering the phone came with a 5V charger?
Sent from my Galaxy Nexus using Tapatalk
I wouldn't use it. The 0.1v probably won't make any difference, but it may not be regulated. Chargers with these odd values sometimes don't have any regulator inside them. That could damage your phone as the voltage could shoot up and down as the current draw changes.
Just search amazon/ebay for any MicroUSB charger, and pick one from a reputable manufacturer like Motorola, HTC, Samsung etc. Since all phones now use MicroUSB, there's loads of these chargers around from previous phone models etc.
Here's just one I saw on amazon.com:
http://www.amazon.com/Samsung-Trave...E70I/ref=sr_1_3?ie=UTF8&qid=1322808220&sr=8-3
Hi, my phone Note 2 baseband/ firmware is N7100UBALI9, but came with power AC charger USA prong(flat) with output 2 Ampere. All knowledge of electronics, I'm just wondering from a professional user (xda devs) is it safe using/charging regular charger output 0.5A or 1A?? or can degrades something inside the phone's/lifespan? All i know the device such iPad needs more Amperes to charge. Please check/see my charger photo below. I'm apologize my english is not perfect. I'm noob beginner. Thank you very much ,appreciate.
bongbongcong said:
Hi, my phone Note 2 baseband/ firmware is N7100UBALI9, but came with power AC charger USA prong(flat) with output 2 Ampere. All knowledge of electronics, I'm just wondering from a professional user (xda devs) is it safe using/charging regular charger output 0.5A or 1A?? or can degrades something inside the phone's/lifespan? All i know the device such iPad needs more Amperes to charge. Please check/see my charger photo below. I'm apologize my english is not perfect. I'm noob beginner. Thank you very much ,appreciate.
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My charger is 2 amp too (bought it Sweden). My older S2 has a 0.7 amp charger (both standard original chargers). The chargers them self can handle the amps printed on them without breaking or extending the charge time. The chargers are more or less "stupid" power supplies. The electronics in the phone handles the battery charge current. The phone even monitors the battery temp, and the charge current can probably be either aborted or limited based on the temp.
My opinion, based on knowledge as a kind of "advanced" electrician...
Note II is designed for the 2A charger, that's what it needs. You can charge with lower outputs, but it'll take a lot longer to do so.
The amperage of the charger does not affect a phone battery life span. The phone draws the amount of amps needed.
I'm guessing since Samsung provided a 2amp charger, that the note 2 should be drawing that much amps. Any other charger with less amps won't harm it, but rather take longer to charge.
Sent from my SPH-L710 using xda app-developers app
So i will not worry. Thanks because i was not sure if okay or not. Thank you guys. Appreciate your answer.
there is a component in the phone which will limit the flow of max current into the phone like the S2 (450amp and 650amp, iirc the values). changer provides 2amps but phone will draw whatever it is needed. in cases if it allows, 2amps speeds up the charging process.
The phone actually draws 1300mA.
change values
sianzb0i said:
there is a component in the phone which will limit the flow of max current into the phone like the S2 (450amp and 650amp, iirc the values). changer provides 2amps but phone will draw whatever it is needed. in cases if it allows, 2amps speeds up the charging process.
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hi! do you know how to change those iirc values? the charger provided with my note2 is rated 2A out. but when i charge, this charger generates a lot of heat. i think the heat is wasted current since the phone doesn't accept that much current. i just want to know how can i adjust these values.
thanks!
psycotrompus said:
hi! do you know how to change those iirc values? the charger provided with my note2 is rated 2A out. but when i charge, this charger generates a lot of heat. i think the heat is wasted current since the phone doesn't accept that much current. i just want to know how can i adjust these values.
thanks!
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your charger is converting Alternating Current from your wall socket into Direct Current for your phone. The process isnt 100% efficient.
In PC's theres normally an efficiency rating that tells you how many watts of AC current is required to produce a certain amount of watts of DC current (converting from 110-240V down to 12V). ie. a 90% efficient power supply will draw 1000W of AC from your wall to produce 900W of DC for your PC. the remainder of that energy is lost in the conversion process and is often released as heat and other forms of energy.
same thing is happening in your charger. in the process of converting AC to DC (110-240V down to ~5V), some energy is lost, and some of that lost energy is released as heat. our note 2 can handle 2A of current with no issues, the heat is because our chargers are not 100% efficient in their conversion, not because the phone cant handle the current.
Hi
watch this video to get all info about the Optimus G battery
https://www.youtube.com/watch?v=O7Q8E5dzyxg&list=PLShKiWbiCfxbiMFDOHnS2Y_2HzAMwsRpI&index=26
Nice tech. I liked the way they managed cpu activities besides all.
My question is that why it takes around 2:30 to charge the phone fully?
According to this: http://www.qualcomm.com/media/blog/...-charge-10-less-time-charging-more-time-doing
OG benefits from Quick charge 1.0 which should boost charging process. Is it boosted by default? Is 2:30 fast enough for a 2100 mAh battery? or it's something kernel related and should be enabled?
2:45-3:00 its the charging time and its just fine.
You can always use a bigger charger and ruin your battery faster. Or explode..
Sent from my G using Tapatalk Pro
nikos523 said:
2:45-3:00 its the charging time and its just fine.
You can always use a bigger charger and ruin your battery faster. Or explode..
Sent from my G using Tapatalk Pro
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I don't want to ruin my battery bro. I'm just curious to know if other phones with the almost same specifications have similar charging time or not. I mean is this normal or not? Do you know about nexus 4 charging time? or xperia zr? these all have quick charge 1.0 while snapdragon 800 offers quick charge 2.0 and that's why phones like G2 having a battery with more capacity have under 2 hours charging time.
nikos523 said:
You can always use a bigger charger and ruin your battery faster. Or explode..
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Well... Unless you use a charger that sets a current (extremely unlikely), it won't matter a single bit. Just a simple physics... All standard chargers provide stabilized voltage within certain current limits (that's your charger's Amp rating). The phone's battery charging circuit determines the current it draws from a charger. So, even if your bad-ass charger is capable of providing 10A output, your phone will not draw more than it needs when charging, which is about 1A (sorry, I don't know the exact charging current of the OG).
kt-Froggy said:
Well... Unless you use a charger that sets a current (extremely unlikely), it won't matter a single bit. Just a simple physics... All standard chargers provide stabilized voltage within certain current limits (that's your charger's Amp rating). The phone's battery charging circuit determines the current it draws from a charger. So, even if your bad-ass charger is capable of providing 10A output, your phone will not draw more than it needs when charging, which is about 1A (sorry, I don't know the exact charging current of the OG).
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the charging current of OG is 1.2. So, you mean the phone won't be charged faster if one uses a higher voltage charger?
akahroba said:
the charging current of OG is 1.2. So, you mean the phone won't be charged faster if one uses a higher voltage charger?
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If you use a higher voltage charger, you could simply fry your phone -- depends on the actual voltage. The protection circuit may simply shut off the input, or limit the voltage at 5V -- I don't know enough about the OG's schematics. But it should still limit the current at the value it's designed for. Anyway, I wouldn't experiment with that... But if you are talking about higher Amp-rated charger with 5V output, then it won't charge faster, unless the lower-rated charger is actually rated lower than the phone would take. Here, just a couple of examples, assuming 1.2A nominal charging current...
Example #1: 0.7A charger. The phone is trying to suck as much as it needs, but the charger can only supply 700mA. So, it will charge slowly.
Example #2: Stock 1.2A charger. The charger is supplying just what the phone needs, which is 1.2A. So, it will charge faster.
Example #3: 2A charger (or more). The phone will still draw 1.2A, even though the charger is capable of supplying more. So, it will charge at the same speed as with 1.2A charger.
Makes sense?
kt-Froggy said:
If you use a higher voltage charger, you could simply fry your phone -- depends on the actual voltage. The protection circuit may simply shut off the input, or limit the voltage at 5V -- I don't know enough about the OG's schematics. But it should still limit the current at the value it's designed for. Anyway, I wouldn't experiment with that... But if you are talking about higher Amp-rated charger with 5V output, then it won't charge faster, unless the lower-rated charger is actually rated lower than the phone would take. Here, just a couple of examples, assuming 1.2A nominal charging current...
Example #1: 0.7A charger. The phone is trying to suck as much as it needs, but the charger can only supply 700mA. So, it will charge slowly.
Example #2: Stock 1.2A charger. The charger is supplying just what the phone needs, which is 1.2A. So, it will charge faster.
Example #3: 2A charger (or more). The phone will still draw 1.2A, even though the charger is capable of supplying more. So, it will charge at the same speed as with 1.2A charger.
Makes sense?
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Oh, I see. Thanks. But, I don't know about the schematics either. I don't know if the phone has this smartness to draw as much as it needs or just draws as much as given. So, I won't risk either.
akahroba said:
I don't know if the phone has this smartness to draw as much as it needs or just draws as much as given. So, I won't risk either.
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Regardless of particular schematics, a properly designed charging circuit is always drawing the set current from a source. In other words, your phone is definitely smart enough to only take what it needs. Basically, "as much as given" in this context is incorrect statement... A charger "gives" a specific voltage (5VDC for USB-charged devices), and the device "takes" a specific current. So, no matter what the Amp rating of a charger is, it will only give as much juice (Amps) as the device decides to take (within a charger's Amp limit). If a charger can't provide enough current for the device, then you have a problem with slow charge, or no charge at all. But higher Amp-rated chargers are fine. If you have, let's say, a charger from a tablet rated at 2.5A, or a stabilized lab power supply rated at 20A, both of them would be OK to use for charging your OG. The only possible problem in this case could be a defective charging circuit in the phone, which might not limit the current the way it's designed to, and could draw enough from a high-powered charger to kill itself. Low-powered charger would simply not be able to provide a dangerous current, if that happens...
Having said that, I've got quite a zoo of various power supplies laying around, and I used all kinds of them rated up to 30Amp to charge different devices. Never had any problems.
Having said that, I've got quite a zoo of various power supplies laying around, and I used all kinds of them rated up to 30Amp to charge different devices. Never had any problems.
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and you've never seen any acceleration in charging time? So, it's just a common mistake that people say higher Amp-rated charger results in faster charge?
E977 battery difference?!
look at these two screenshots. one of them is E977 (in Spanish) and the battery is written to be SiO Lithium-ion. (SiO+ is used in G2)
the other is for E975 and the battery is written to be Lithium-Polymer.
Are these two the same?! Or this is an improvement made in hardware revision 1.2?
akahroba said:
and you've never seen any acceleration in charging time? So, it's just a common mistake that people say higher Amp-rated charger results in faster charge?
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As I said before, it really depends what exact Amp ratings you are comparing... If a charger is rated lower that a phone's charging circuit, it will certainly underperform, and will charge slowly. But if your charger's rating matches or exceeds the charging current required by phone, then it makes no difference.
I personally don't have an OG stock charger, so I don't have any experience using a charger rated specifically at 1.2A. I only have USB chargers rated at 700mA, 850mA, 1A and 2A. Plus, an assortment of other power supplies rated anywhere from 2A to 30A. Of course, I do see a faster charging when going from 700mA charger to 1A, and then to 2A, because the first two are under-rated compared to the phone's specs. However, once I go with 2A or the higher rated power sources, there's no difference at all.
Hope that explains it.
kt-Froggy said:
As I said before, it really depends what exact Amp ratings you are comparing... If a charger is rated lower that a phone's charging circuit, it will certainly underperform, and will charge slowly. But if your charger's rating matches or exceeds the charging current required by phone, then it makes no difference.
I personally don't have an OG stock charger, so I don't have any experience using a charger rated specifically at 1.2A. I only have USB chargers rated at 700mA, 850mA, 1A and 2A. Plus, an assortment of other power supplies rated anywhere from 2A to 30A. Of course, I do see a faster charging when going from 700mA charger to 1A, and then to 2A, because the first two are under-rated compared to the phone's specs. However, once I go with 2A or the higher rated power sources, there's no difference at all.
Hope that explains it.
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Yes, the last sentence clarified it. Thanks alot mate.