They were sayn that wifi saves batt up to 50%. Ive always been told the exact oppisite. Wifi kills batt life. Wtf
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harley1rocker said:
They were sayn that wifi saves batt up to 50%. Ive always been told the exact oppisite. Wifi kills batt life. Wtf
Sent from my SPH-D710 using xda premium
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Depends on distance/strength of wifi signal...
It's a good way for them convince you to not use your data connection for a while and slow down the network.
Sent from my Super Galaxy'd SPH-D710
I got an email/text or statement insert saying the exact same thing. Funny thing is ever since that statement I have always made sure to have wifi on when home.
I know it sorta turns off when disconnected but then it scans and picks up wifi networks so I just turn it off when I leave the house.
On my OG Evo I did not notice any change in battery life with wifi on.
Searching for WiFi is what really kills the battery which is why I turn mine off and on manually rather than leaving it on. If I'm in an area with WiFi available and my 3G signal is low, then I'll turn on my WiFi, also when I'm at work or home my WiFi is always on but if I'm out and about then I keep WiFi off rather than have it drain my battery constantly looking for signal.
Technically, I think Wifi takes up less battery than, say 3G when actively used.
Just a guess o-0
MochaCharok said:
Technically, I think Wifi takes up less battery than, say 3G when actively used.
Just a guess o-0
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I would think this is true, especially if you're sitting close to the router like at home or work rather than pinging off a cell tower however far away.
It goes both way guys. When idle, wifi consumes more battery than an active cellular data connection.
By virtue of simply being more efficient, wifi consumes "less" when actively using it. This is, however, because of the generally increased data speeds: it takes less time to accomplish a task (I.e. downloading a file), thus providing battery savings. In this regards, even 4g consumes less battery, even though it technically takes more juice to run 4g.
The way to really look at it so it becomes clear is say, hypothetically, you had a wifi connection whose internet side connection was very slow. In this regards, wifi doesn't save you any battery, and will probably end up consuming more, simply because its gain in efficiency is now gone.
Of course sprint wants us to get off cell data as much as possible, but in a lot of real world situations, it will save someone battery. Take my typical work day for example:
I wake up at home, drive to work, stay at work all day, then go home and probably stay there. I have good wifi connections both at home and work. Now, if I was the kind of user that didn't auto sync anything, I would probably end up using more battery life than I need to if I left wifi on all day, simply because I'm pumping juice into a radio that isn't being used.
However, I DO use a lot of auto sync functions, which means that my phone is actively using data a lot throughout the day. In this case, the battery drain due to the time in which wifi is left idle is out-weighed by the gain in battery life I get by the times my wifi is now being used instead a cell connection.
In a nutshell, as I said at the beginning, cellular data connection is more efficient at being idle than wifi (provided it's a good connection), and wifi is more efficient at being actively used (again, provided it's a good connection and the internet-side speed is sufficient).
Sent from my SPH-D710 using xda premium
My battery last far longer on wifi than 4g, not even close in my book.
Since I have wi-fi at work and home I can say there is a HUGE difference - especially since at home and work the 3G/4G signals are so weak that the phone burns quite a bit of battery just searching for a signal. Hoping that this will change as NV completes in the area but it might be the frequency that we're on is not too friendly with the newer building materials.
Yes, using wifi will save you more battery life than using your 3g/4g
Pastie13 said:
My battery last far longer on wifi than 4g, not even close in my book.
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4g is a completely different animal than 3g when it comes to battery drain. So far when on 4g your battery life is sucked out of your phone. The email Sprint sends out I would safely say is comparing 3g to wifi.
That same tip is on Sprints website when you log into your account. It is on the right hand side.
As for battery life my findings have been WIFI uses less juice when the signal is good. 3G uses less juice when the throughput is good. So when I am on 3G in an area that has good speeds I can hit near 30 hours of battery.
I can do the same on WIFI when the WIFI signal is good, but if the WIFI signal is on the lower end the throughput slows since the quality has been lowered.
So in essence the better the throughput the better the battery, because when the phone wakes to check on any sync items setup the longer it takes to make that check the longer the CPU is at max and the more battery drain occurs. And I'm not talking signal strength for 3G since you'll get more drain on the battery in lesser areas because the phone is naturally going to have to boost the transmitter power. I'm talking best signal and crappy 3G network throughput. That is where the drain comes from.
I have tested this in my house with my WIFI and my Airave. On WIFI if I go outside my WIFI range is really bad and my battery drains a lot quicker. If I turn off the WIFI and use the Airave, which has a much higher transmitter power, I can get great battery. I have also seen this in over night testing. My WIFI is in the living room which is 5 walls away and the signal is pretty poor. If I leave my WIFI on over night and not charge my phone I loose 50% battery and when trying to use my phone for internet I get super bad throughput since I am on the edge of the signal. But turn off my WIFI and ride on the Airave I only loose 15% over night and the internet is great, but limited to 1.5m since it is 3G. So if you download a 1meg attachment. 3G takes 2 min and WIFI take 4 min then 3G will use less battery. This also goes vis versa. Whoever is maxing the CPU the longest is your battery killer because both are always on and always ready when they are selected.
Hope I didn't go into to much detail, but transmit power is not the big thing here it is throughput quality of the signal. The worst the throughput the more time it takes to transmit and thus more battery as the CPU is maxed till the job is complete.
Related
Am i right in thinking the main culprit for wasting battery is 3G? when i use WIFI and am at home, the phones goes easy 2 days and im watching youtube, playing angry bird, chatting on gtalk.
with 3G, lucky to get a full day, normally dies towards the end,
so how come 3G kills the battery so hard is there a remedy to it lol
thanks
3g could be trouble when you have weak or unstable signal. In normal cases wifi uses more juice.
for me, 3g doubles the consumption compared to wifi. (t-mobile uk)
Similar issues here on 3 in the UK using official HTC unbranded ROM with radio 32.44.00.32U_5.09.05.30_2. I can get well over a day with as much use as I wanton WiFi but if I switch it off and move to 3G (HSDPA) I completely flatten a battery in anywhere from 3 to 8 hours, sometimes with minimal actual usage!
Sent from my HTC Desire using XDA App
yh on t-mob too, it could be the signal as iv read weak signals can drain battery, its strange, normally its wifi that drains the battery, but i have it on all day , dont have any inactivity settings on, its full blast all day and the battery stays 70-80% by round 1am when i sleep,
3g, it will be around 20% at that time, it is a strange one
While idle 3G uses more power than WiFi.
While active WiFi uses more power than 3G.
While that may like it seem like WiFi can use more when actively using it. It also finishes quicker and goes back to idling. Which uses less power in the end.
Both use more if the reception/signal is weak, as it's constantly trying to (re)connect.
What saves more battery? Leaving my phone on wifi at work, or just letting it run on the hspa network? The wifi is a little bit faster.
durps said:
What saves more battery? Leaving my phone on wifi at work, or just letting it run on the hspa network? The wifi is a little bit faster.
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WIFI saves battery: Heres a thread just like yours check it out almost the same title too: "Using WiFi in the office instead of 3g for better battery life?"
http://forum.xda-developers.com/showthread.php?t=904033
wifi actually saves battery, but really depending where you are. I am always on wifi and i seem to be fine on battery. The constant data switching between speeds tend to lower battery faster than wifi
sent from my V I S I O N.
Yes I can attest to it also, I've went WELL over 30 hours (I think unplugged on a Saturday at 5pm, and then still had 10% left on Tuesday afternoon) on Wifi whenever possible, and using Edge with no background sync when I was out of a wifi range. I would post a pic but didn't take it, and this seems to doesn't work on CM7 for me, not even after wiping battery stats.
I get AMAZING battery life when I'm on wifi but terrible battery when I'm not. I send/receive about 300 texts a day easily and so I have the screen on frequently. I also use web a lot. On wifi my battery will last about 20-24 hours probably. Currently I'm at 67% on 6 hours. Without wifi, I will get about 8-10 hours with the same kind of usage.
I just want to know why there is such a large discrepancy. Im in NYC so my signal is pretty strong.
I used to think it was the screen that used up so much of my battery life but now I'm thinking it's the radio.
I'm on Juggernaut. If anyone has a suggestion I'm all for it. Should I try a different kernel? If so, which one?
Sent from my SGH-T989 using XDA
Jugs with dark x kernel works very well with me i use faux clock to clock it at 1.7 and 384 gettin 16-17 hours of battery life with lots if texting and browsing hope it works
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So when you use your phone, do you not expect the battery life to go down? It can't stay at 100% after everything your doing..
I recommend Juice Defender. It turns off data when your screen is off. Sounds like you're getting a lot of screen off drain.
cashyftw said:
So when you use your phone, do you not expect the battery life to go down? It can't stay at 100% after everything your doing..
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I do expect it to go down. Hence I thought it was normal until I noticed a huge difference in battery between being on 4g v. wifi and getting double the battery life while doing the same things.
I'm just wondering why the 4g takes that much more than my wifi and if a kernel would be an issue
Sent from my SGH-T989 using XDA
disturkis4u said:
I do expect it to go down. Hence I thought it was normal until I noticed a huge difference in battery between being on 4g v. wifi and getting double the battery life while doing the same things.
I'm just wondering why the 4g takes that much more than my wifi and if a kernel would be an issue
Sent from my SGH-T989 using XDA
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The simplest explanation that I can come up with is twofold.
First 4G requires a MIMO type of connection, even on T-Mobile. So for the really high speed connection it actually uses more than 1 antenna and powering more than one antenna takes up more power.
The second part is that 4G connections are not as prevalent as 3G connections so your phone has to search for the closest 4G network more often to maintain the fastest connection and the network searching takes up even more data then than the MIMO style connection the phone uses for 4G.
The combination of these two will drain your battery much faster than a single antenna connection to your home wi-fi that does not have to pass as many syn/ack packets to maintain the connection as the 4G network and thus uses less energy.
(MIMO stands for multiple in, multiple out which means it uses more than one antenna for incoming and outgoing transmissions)
(Wirless-N is MIMO based as well but does need to use as many "discovery or syn/ack packets" to maintain the connection)
I second juice defender. You can configure it to turn off data while the screen is off which will not effect your ability to receive phone calls or text messages.
Sent from my SGH-T989 using XDA
Hey,
when I use 3G I get about 2H of screen time,
and when I use WiFi I get about 4H (max).
My usage is WhatsApp, Browser etc..
Is it normal that I'm getting half of the time with 3G?
Can it be fixed with another baseband?
Any help?
3G uses more battery since it's also searching for better connection all the time(unless you choose 2G only in mobile network options, then you get better battery but speed is not so fast anymore).
I can confirm that a weak 3G connection gobbles up battery charge very quickly. This is a flaw in the radio firmware or perhaps somewhere else. Of course the phone should switch to 2G automatically when 3G is not used intensively, but uses excessive amounts of electricity, but the designers apparently overlooked this.
Your main option is, as already mentioned, to do the thing manually that your phone fails to do automatically—force 2G only.
If you do that, don't forget to disable the force-2G option again when (a) you need the higher speed and the connection is good enough for that, or (b) if you moved into an area with better reception, like 3 or 4 bars.
Alternatively, leave the settings untouched, i.e. 3G enabled, and keep charging the phone if you are stationary and have electricity nearby. You can charge from a computer, albeit at half speed.
I almost always have 3/4 bars, so I don't think I have a connection problem.
My battery was doing well, had about 70+% remaining after about 5-6 hours on battery, then in a one-hour stretch it dropped 30%. I'm running battery doctor, but it really isn't telling me what could have caused that. Even after a half-hour con-call this morning, the battery was still at 80% or so until noon.
It seemed to fall off the cliff when I left the house for about an hour to run some errands. But 30% when you're not doing a lot with it in an hour's time frame seems like an issue.
Anyone have any ideas on how to debug this?
mikecico said:
My battery was doing well, had about 70+% remaining after about 5-6 hours on battery, then in a one-hour stretch it dropped 30%. I'm running battery doctor, but it really isn't telling me what could have caused that. Even after a half-hour con-call this morning, the battery was still at 80% or so until noon.
It seemed to fall off the cliff when I left the house for about an hour to run some errands. But 30% when you're not doing a lot with it in an hour's time frame seems like an issue.
Anyone have any ideas on how to debug this?
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I'd like to know as well. I'm at 33% at 7 hours usage.
Sent from my VS986 using Tapatalk
Were you using GPS? That's killer on the battery when you combine it with other drains
Also perhaps you ventured into a low signal area, so the phone was straining the battery to connect to a poor signal?
Samething here ... even after a factory reset & disabling a bunch of bloats.
It idles fine @home but really sucks @work ... I lost 30% (last 3hr idling) with the screen off (wifi off too, location is off, greenify running).
Phone barely lasts 2 days (with ~1hr scrren on, 1-call/2-TxtM a day, no emailing ... minimal usage).
One thing I notice... data signal @work is pretty bad (3G) while better @home (LTE).
This is a Verizon phone. My G2 was much much better, same exact setup.
This might sound like the opposite of what is intuitive, but your battery life at work may *increase* if you turn *ON* the wifi.
The reason is that you have poor 3G signal strength. So every time your phone updates anything data related, even just checking that you have an email, the phone burns a lot of battery trying to squeeze data over the poor signal from the cell tower.
But, if you turn on wifi, the phone can check all the data stuff using the wifi, which is far less battery intensive compared to trying to talk to the cell phone tower far away.
So try that, just turn on wifi *particularly* when you are in a poor cell phone reception area. Even though you now have an *extra* radio turned on in the phone, it should greatly help while at work or in any low signal area that has wifi available.
when did you get the phone? you have to do a few full charges and disable some Google bloat for the battery to last. and remove batter doctor. don't use apps like those task killers that keep themselves in the background like avast security. i just use lookout since it doesn't overly do it's job like avast.
What carrier are you on? If its T-Mobile, then its probably the My T-Mobile app. Drained my phone like crazy, T-Mobile also knows its an issue, but haven't said anything on fixing it.
Just uncheck all the boxes in the settings and it should stop, if not try the debloater tool.
Sent from my LG-H811 using Tapatalk
KingFatty said:
This might sound like the opposite of what is intuitive, but your battery life at work may *increase* if you turn *ON* the wifi.
The reason is that you have poor 3G signal strength. So every time your phone updates anything data related, even just checking that you have an email, the phone burns a lot of battery trying to squeeze data over the poor signal from the cell tower.
But, if you turn on wifi, the phone can check all the data stuff using the wifi, which is far less battery intensive compared to trying to talk to the cell phone tower far away.
So try that, just turn on wifi *particularly* when you are in a poor cell phone reception area. Even though you now have an *extra* radio turned on in the phone, it should greatly help while at work or in any low signal area that has wifi available.
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This will still drain it heavily even on wifi. It will continue to struggle to get good bars and will do what it takes in order to achieve good reception.
At work I always have wifi on and my drain is very high.
A weekend at home and I easily got SOT of 4 hrs+.
Work day, I struggle to get SOT of 2 hrs+
Very interesting approach, and it seems to work. I tried this overnight, and the falloff didn't seem nearly as great as when the wi-fi setting is off.
Many thanks.
I'm on verizon and when my phone switches to 3G it gets super hot upper middle area of the screen and the battery drain is outrageous. I have to disable data otherwise it would probably burst into flames. My previous unit did not have these problems. Wish I would have kept it.