Just got the 4000mAH ZAP Portable Energy battery.
The provided adapters do NOT have a Standard USB-to-mini 5-pin USB all male adapter which is required for charging the Universal from the ZAP battery. You'll require this piece which costs a few dollars only.
Specs here:-
http://www.zapworld.com/PE/ZAPd14.asp
Under Additional Info you can see that the USB output current is 700mA with 4 - 6 V. The AC adapter output DC voltage and current to the Universal is 5V 1A. Hence, the ZAP battery is usable although the compatible PDA list does not show.
Here:-
http://www.zapworld.com/PE/pe_pr.asp
I'm using it. USE AT YOUR OWN RISK!!
RE
Sorry, subject should read 4000mAH instead of 400mAH
Can the mod please correct it. Thanks
RE : 4000mAH is NOT at 5V
Just to make some clarification
The 4000mAH is at 3.7V
So, at 5V the mAH would be much smaller
Related
(repost because of the forum 'difficulties')
I am looking for a DIY solution to charge / operate my MDAII or my GPS (for both I have a USB charge cable) from a regular battery pack via a standard USB socket.
Normally USB voltage is approx 5V and a current of approx 400ma is needed for it to work.
I have a pack which can contain 4 penlite (AA type) batteries. There are 3 possible 'simple' configurations:
1. Use 4 alkaline batteries = 6V
2. use 3 alkaline batteries = 4.5V
3. Use 4 rechargeable (NiMH) batteries = 4.8V
What would be the best configuration?
Should I use some sort of voltage regulator?
Any experience with the commercially available emergency chargers?
I dont really understand.. do you need to power supply a Usb device?
You need to know the Specifications of your gps,about V max..
If it support use 6V batteries,and-or with resistor
or simply 4.6V,Verify also the mAh you need to give.
Ah..maybe I undertand..you need a pack that will charge your XDA2?
So.like the Specifications..you need to give 5V and about 2A...
Use 4 rechargeable 1,2V-500mAh batteries for best results.
or some lower..but it will charge your battery slowly
Thats right, I need a battery-pack to give the devices I have more power.
The current needed is 400-500mA, the voltage needed is approx 5V.
The 2A as stated on the XDA2 charger is much higher than needed by the XDA2.
I remember I had some good replies on this before the crash . . .
So I was wondering: is there a difference in charging speed between the a/c wall charger and charging from my computer's USB port? Also, what's the difference between different chargers? For example, the Desire comes with a charger that puts out 1 amp. My girlfriend's BlackBerry has a micro USB charger as well, but the output is 700 mAh, or 0.7 amp. I've seen chargers ranging from 500 mAh (0.5 amp) to 1200 mAh (1.2 amp). How does this equate to charge time? Does it even? Or does the phone regulate the charge rate?
Benny_L said:
So I was wondering: is there a difference in charging speed between the a/c wall charger and charging from my computer's USB port? Also, what's the difference between different chargers? For example, the Desire comes with a charger that puts out 1 amp. My girlfriend's BlackBerry has a micro USB charger as well, but the output is 700 mAh, or 0.7 amp. I've seen chargers ranging from 500 mAh (0.5 amp) to 1200 mAh (1.2 amp). How does this equate to charge time? Does it even? Or does the phone regulate the charge rate?
Click to expand...
Click to collapse
You've pretty much answer your own question!
The current supplied by a charger/USB port determines how fast it can charge the battery, which is why the wall charger (1amp) charges much faster than a PC USB port (0.5 amps).
Regards,
Dave
It's almost completely logical.. say you have a 1.5A battery (1500mA) and a 500mAh charger (ie USB) then it will take 3 hours for it to charge but with a 1000mAh charger it will take an hour and a half.
Can't really explain it more than that, so hth.
Well , Yes and No
This is only partly true ......
If you charge it on the PC , max output is 0.5 amps , and data is possible while charging .
Now with Desktop and car charger , the amp can be anything the manufacturer likes but you have to keep the following in mind :
USB Specs state the following :
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
In Battery Charging Specification,[32] new powering modes are added to the USB specification. A host or hub Charging Downstream Port can supply a maximum of 1.5 A when communicating at low-bandwidth or full-bandwidth, a maximum of 900 mA when communicating at high-bandwidth, and as much current as the connector will safely handle when no communication is taking place; USB 2.0 standard-A connectors are rated at 1500 mA by default. A Dedicated Charging Port can supply a maximum of 1.8 A of current at 5.25 V. A portable device can draw up to 1.8 A from a Dedicated Charging Port. The Dedicated Charging Port shorts the D+ and D- pins with a resistance of at most 200Ω. The short disables data transfer, but allows devices to detect the Dedicated Charging Port and allows very simple, high current chargers to be manufactured. The increased current (faster, 9 W charging) will occur once both the host/hub and devices support the new charging specification.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
So if your Desire ( Yes , the Desire supports these specs ) detects the short , it will switch to fast charging mode otherwise it will limit the charging current .
Unfortunately , there's no way to know , just by looking at a charger, if it respects the specs or is just a low cost 5V powersupply . I've encountered quite a few ( mostly lowcost) desktop and car chargers that are rated between 1 and 2 amps , but still take bl**dy ages to charge the phone . Checking those with a measuring tool , you usually see the data pins are "Not Connected" instead of being shortened :-(((
Final Word .... don't try to save some money on a cheap charger , you'll regret it Genuine HTC works great , others do the same , but don't expect a $1 charger from Hongkong or whereever to do it !
These are the theoretical specs. Keep an eye on charger efficiency ratings and battery charge absorption won't be 100% in any case. Also bare in mind the charge is not linear, it will trickle after approx 80-90% with this phone.
-----------------------------------
- Sent via my HTC Desire -
th3 said:
These are the theoretical specs. Keep an eye on charger efficiency ratings and battery charge absorption won't be 100% in any case. Also bare in mind the charge is not linear, it will trickle after approx 80-90% with this phone.
-----------------------------------
- Sent via my HTC Desire -
Click to expand...
Click to collapse
Ya, I noticed the charge slows down considerably for the final 10-15 %
I find myself charging my Desire more than I actually use it, lol.
I found now the answer to this problem: I use a Nokia charger (5v and 890 mA) with a microusb adapter. You can find one on eBay at ~2$
Now it takes about 2 hours from 20% to 100%
Lets hope nothing wrong happens to my precious Desire
look here for a method to charge at ac speed from usb, explains a few things too.
Is this the highest?
http://www.seidioonline.com/product-p/pmc.htm
Post links if you know of higher ones, thank you.
Sent from my ADR6400L using XDA App
There are 2.1A usb adapters, but I don't think microUSB can take advantage of it. The one you linked is a 1A, which is the same as the wall charger HTC gave with the phone. I'm currently using a 1A usb adapter in my truck.
Ok that's probably what I'm looking for then. Are there wall chargers greater than what came with the phone that I can take advantage of?
Your best bet would be to try the USB adapters made for iPads. The Apple products can utilize the 2.1A chargers with their sync cables, but I'm not sure if a microUSB cable can though. I have some 2.1A wallchargers from some of my Apple products, I'll test them later and let you know what I find out.
http://www.verizonwireless.com/b2c/...ryDetails&archetypeId=12299&accessoryId=46370
I just got an Enercell from Radio Shack with dual usbs. Max output is 2.5A divided between the two ports.
http://www.radioshack.com/product/index.jsp?productId=11329448
on sale now for only $14.99. Seems to be of good quality.
The Motorola rapid chargers rock.
Guys, unless you mod the usb adapter 5V spec, you aren't doing squat with a "high power" adapter. The device has an input impedence that will draw a certain amount of current at 5v., and that's it.
Standard battery: 1400 mAh
Time to charge: 4 hrs (according to manual)
That's 1400/4 = 350 mA.
Most adapters on the market spec more than that, they're usually 500 mA or above. And again, unless you boost the volts, you're not going to be able to push more than 350 mA or so.
So don't waste you're money.
On the other hand, if your going to share a car outlet with another device like mp3 or ipod, then yeah, you'll need a higher output, two port, adapter.
Edit: It just occurred to me that if you're using the phone heavily while charging, then yeah you may need more than 500 mA. My currrent widget shows the phone can draw another 250 mA or so during use. That plus the charge totals to around 600 mA. But depending upon design, the phone may not be able to pull in all 600 mA. A test with a current meter would be real interesting.
The charger shipped with the Thunderbolt is a 1 Amp charger.
If I use a 500 mA charger the Current Widget shows a +450mA charge current. However if I use the 1A charger, I get a charge current of about +850mA.
Given that the google navigation gobbles over 400mA when running, you need a car charger with greater than 500mA capacity of you want the phone to charge at the same time.
Sent from my ADR6400L using XDA App
boingboingbilly said:
The Motorola rapid chargers rock.
Click to expand...
Click to collapse
Good to hear, I ordered one today for $11 on ebay. I had heard other people say they liked that one too.
Ecomaniac said:
Guys, unless you mod the usb adapter 5V spec, you aren't doing squat with a "high power" adapter. The device has an input impedence that will draw a certain amount of current at 5v., and that's it.
Standard battery: 1400 mAh
Time to charge: 4 hrs (according to manual)
That's 1400/4 = 350 mA.
Click to expand...
Click to collapse
You're making the incorrect assumptions that the charging rate is constant, and charging is 100% efficient. Li-ion batteries can be charged at up to a 1C rate (i.e. 1.4A for a 1400 mA cell). Add the power drawn by the phone itself, and a 1.8 Amp charger might not be unreasonable (1.8 A is the specified limit for micro USB connectors). Whether the phone will actually do a maximum rate charge, I don't know.
This, from a TI Application Note (Google for SLAA287, board won't let me post links):
A Li-Ion battery charging process consists of three stages:
· Slow Charge: Pre-charging stage using current of 0.1C
· Fast Charge: Constant current charging stage using current of 1C
· Constant voltage charging stage
During the slow charge stage, the battery is charged with a constant low charge current of 0.1C, if the battery voltage is below 2.5V. The slow charge stage is rarely used during the charging process of a Li-Ion battery.
The fast charge (constant current) and constant voltage charging are the most important stages during a recharge process. Most Li-Ion batteries have a fully charged voltage of 4.1 or 4.2V.
The battery is first charged with a constant current of 1C until a battery voltage reaches 4.1 or 4.2V. The firmware continuously checks the charging current by sensing the voltage at the current sense resistor (Rsense) and
adjusts the duty cycle of PWM output from the MCU. The battery's voltage is checked frequently.
Whenever found the battery's voltage reaches 4.1 or 4.2V, the charger will switch to constant voltage charging mode. The battery is then charged with a constant voltage source at a fixed battery voltage of 4.1 or 4.2 V...When the charging current falls below 0.1C, the charging process must stop.
Click to expand...
Click to collapse
Monoprice has Cig to USB(1A) chargers and the USB to Micro cables in multiple lengths(I ordered 6' ones) for far cheaper than you will find anywhere else
mike.s said:
You're making the incorrect assumptions that the charging rate is constant, and charging is 100% efficient. Li-ion batteries can be charged at up to a 1C rate (i.e. 1.4A for a 1400 mA cell). Add the power drawn by the phone itself, and a 1.8 Amp charger might not be unreasonable (1.8 A is the specified limit for micro USB connectors). Whether the phone will actually do a maximum rate charge, I don't know.
This, from a TI Application Note (Google for SLAA287, board won't let me post links):
Click to expand...
Click to collapse
very useful, thanks!
walbuls said:
Monoprice has Cig to USB(1A) chargers and the USB to Micro cables in multiple lengths(I ordered 6' ones) for far cheaper than you will find anywhere else
Click to expand...
Click to collapse
I second monoprice.
I tried bunch of cig to usb car charger and none matched advertised output... They all showed Charging (USB). I now use AC inverter and it charges just like a wall charger.
eccenpix said:
I tried bunch of cig to usb car charger and none matched advertised output... They all showed Charging (USB). I now use AC inverter and it charges just like a wall charger.
Click to expand...
Click to collapse
I suspect you need to find one which properly follows the USB Battery Charging Specification. That link is to the most recent version, which came out on 7Dec2010 (remember Pearl Harbor!). Version 1.1 is easier - a Dedicated Charging Port is indicated by shorting together the data lines (the two middle conductors on a full sized USB connector. By doing so, it indicates the device may try to draw up to 1.8 A of current (although a dedicated charging port is allowed to limit the current to less than that, it must provide at least 1.5 A).
I bought a cheap USB hub with 5 ports, used an exacto knife to cut the traces going to the data lines (the middle two) on all the ports, and then shorted them together on each port. It's now no longer a USB hub, but a USB charger with 5 ports I can used to charge stuff (phone and Bluetooth, quite often). The AC adapter which it came with does 2 Amps. My Thunderbolt says "Charging (AC)" when plugged into it.
So, if you can open up one of your adapters, just solder a jumper between the middle two contacts (make sure they're not connected to anything else).
Just got the Rocketfish premium microUSB at Best Buy and it has a captive coiled cord and a USB port. TBolt says "AC plugged" and reads +670 mA.
Good choice on the Motorola Rapid Charge - I've burned through 3 other cheap car chargers trying to keep my phone alive while using Google Nav and this is the first one to work!
i have the rapid motorola one on amazon
lippstuh said:
i have the rapid motorola one on amazon
Click to expand...
Click to collapse
+1 Works great! Battery widget usually shows about +800mA while only charging. Real close to the wall charger
I'm about to buy one of the i9300 compatible external batteries, such as the Anker Astro 2, Anker Astro 3 or one of the Powergen brand (The 12000 mAh one looks AWESOME). But before I do that, I was wondering if the charge ratio from this kind of batteries to the device is similar to the PC USB (Which takes forever) or the AC charger (That would be very nice).
The aim is to avoid running out of power in a long trip with heavy use of the device.
Anyone of you have experience with this kind of stuff? any recommendations?
Thanks for your time guys.
It should be similar to the charge rate of the wall charger. The astro3 has dual 5v 2A outputs and the astro2 has a 5v 1A and a 5v 2A output. The stock wall wart outputs 5v 1A.
Sent from my SGH-T999
I recently bought this for traveling:
Anker® Astro3E Mobile Battery Pack 10000mAh
I'm very happy with it, the charging is fast and the capacity seems to be as advertised. Not too big, and even looks pretty nice
Sent from my Nexus 7 using Tapatalk 2
Hey guys,
I was recently looking for a high capacity power bank that supported Quick-Charge 3.0 and USB Type C since I have a Samsung Galaxy S7 Edge and Galaxy Tab S3.
After an extensive search, I decided upon the RAVPower 20,100 mAh 3-Port USB External Portable Power Bank (Model #: RP-PB043) as it seemed to fit all my needs. I honestly couldn't be happier with this purchase and thought I'd give it a review.
Pros:
Huge 20,100 mAh Capacity - Uses six Panasonic 3,350 mAh 18650 Lithium Ion Batteries inside. I opened mine up and I managed to get Panasonic cells. The website says you can get Panasonic or LG, depending on regional availability. I was able to charge my Galaxy S7 Edge a little over 5 times. It has a 3,600 mAh internal battery, so this is a respectable efficiency of nearly 90%. You will always lose some of the max capacity due to heat transfer in the charging process. To figure out how many times you would be able to charge your device... take the max capacity of the Power Bank (20100 mAh) and multiply that by the efficiency (roughly 85 to 90% for this model), and divide that by your devices internal battery (i.e. 3600 mAh for GS7 Edge).
High-Speed 2A Input - Most Power Banks only have a 1A input to charge. This means it would take nearly a day to recharge to full capacity for a Power Bank of this size. Fortunately this model has 5V/2A input. I used the included Quick-Charge 3.0 Wall Charger and the Power Bank was fully charged from 0 to 100% in 4 hours and 50 minutes, can't beat that!
3-USB Port Outputs - 1 Quick-Charge 3.0 Port, 1 USB Type C Port, and 1 is art 2.0 Port (See tech specs below). This means this Power Bank supports pretty much any device you throw at it. The iSmart port will even work with those dreaded Apple products that your family members have the misfortune of using.
LED Light Power Indicator - There are 4 White LED Lights that you can check the % of battery life remaining on the Power Bank.
Full Accessory Package: Includes 1 RAVPower Quick Charge 3.0 USB Wall Charger, 2 Small Flat microUSB Cables, a micro USB to USB Type C Adapter, and a nice mesh traveling case. The short microUSB cables are a godsend because they allow you to keep your devices close to the Power Bank without having a huge wired mess. The Type C Adapter will also come in handy because I always need those in a pinch with my Galaxy Tab S3 since I have so many microUSB cables.
Lifetime Warranty - Yes, you read that right. This Power Bank is backed by a Full Lifetime Warranty with online registration (see warranty card in box). This is something unheard of in the Power Bank industry and really means they stand behind their product and its well-built. Not even companies like Anker offer longer than 18 months.
Cons:
Rather Basic Finish - The Power Bank is matte black plastic and nothing exciting in terms of looks. There are no other color options, so if you have a white device, you're out of luck if you want them to match.
Accuracy of LED Indicator - With only 4 LED Indicators, you are left guessing what % of capacity is left. Each dot represents 25% capacity. 0 to 24%, 25 to 49%, 50% to 74% and 75% to 100%. I prefer having a digital display showing the approximate % remaining from 0 to 100%.
No Built-In LED Flashlight - Many Power Banks have a built-in LED Flashlight for the dark. This model DOES NOT which isn't a huge negative, but I still have found myself using it sometimes on other models when the power went out.
RAVPower RP-PB043 Technical Specifications:
Input (Micro): 5V - 12V 2A Max (QC), 5V / 2A (Non-QC)
Input (Type-C): 5V / 3A Max
USB Output: 5V / 2.4A Max
Type-C Output: 5V / 3A Max
QC 3.0 Output: 5V / 2.4A, 6.5V~9V / 1.5A, 9V~12V / 1.2A Max
SIDE NOTE: Not realizing that this Power Bank came with cables included, I also managed to pick up this unique RAVPower 3.3 Ft. 2-in-1 USB 3.0 Type A & Type C Connector Cable (Model: RP-TPC006). I haven't seen anything like this before and when it was on a special Prime Day lightning sale I decided to snag one. It definitely comes in handy because it can be connected with tons of devices since it has dual-purpose connectors. Not only that, but it is also braided and very high quality. If you're in the market for a Type C cable... it might also be worth considering, especially since it also has a Lifetime Warranty.
Current Sales On Products Reviewed Above:
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