Battery life is important for mobile devices. Questions regarding battery life should use this tag.

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177
votes
5answers
30k views

Does constant charging harm my Android cellphone?

I usually disconnect my cellphone from the charger some time after it's fully charged because I'm afraid the battery could lose capacity over time if I don't. However, I believe modern electronics ...
119
votes
20answers
64k views

What can I do to increase battery life on my Android device?

What can I do to get better battery life on my Droid? Battery life seems awful. Less than 15 hours or so on normal usage.
61
votes
4answers
65k views

Battery Life and First Time Charging on Li-ion Batteries. Myth?

"Ok you bought a brand new mobile phone with brand new battery, after checking its working ok kindly switch it off and charge it fully (100%) then start using it. IT WILL INCREASE YOUR BATTERY LIFE.", ...
36
votes
4answers
15k views

Do bright wallpapers spend more battery than dark ones?

I started wondering about this when I realized most websites I visit have white backgrounds, and I know that the screen is usually responsible for most of the battery usage. Since I can't change the ...
33
votes
1answer
71k views

What is *Cell standby* and how can I keep it from eating my battery?

Looking up my battery statistics, I almost always find Cell standby amongst the top consumers: I never thought that "idle" would use so much energy. I saw that other people encounter similar ...
26
votes
3answers
25k views

How to deal with (orphaned) WakeLocks?

I guess most of you at least have heard about WakeLocks. Many of you will have experienced them already -- wether knowingly or not. Some may know how to deal with them in general -- but only few know ...
23
votes
3answers
18k views

Do I have to charge my phone before I use it the first time?

When I got my last phone, a SE k850i, I was recommended to charge it fully once before I even turned it on. Does this apply today as well, for my coming HTC Desire HD? Why was I recommended to do so ...
21
votes
10answers
14k views

How does power usage for data over WiFi compare to data over 3G? (Ignore LTE for now)

If you have unlimited data over 3G so that cost is no option, which is more power efficient? Using the WiFi or 3G connection for data usage? Extending battery life being the goal
17
votes
2answers
3k views

Does 'poor' reception deplete the battery quicker?

In the area where I live I sometimes have trouble with reception. The Internet stops working for me or it takes time to load pages. The phone tries and tries to connect. It seems to me that when this ...
17
votes
4answers
6k views

What is USB debugging? Can I keep it ON forever?

Sometimes I need to transfer some music from my PC to my Galaxy S2 and must always activate USB debugging. Then I think, can I keep it ON forever? I mean, Keep it ON for ever can give me a problem ...
17
votes
4answers
10k views

How can I avoid the battery charging when connected via USB?

I'm using my Samsung Galaxy S2 for development so I regularly plug it while it's not fully charged, and my phone starts charging over USB. I think this (charging while in use) can affect battery life ...
16
votes
1answer
5k views

How does Android obtain battery temperature?

I am curious about the way Android phones obtain the battery temperature. Android has an API called BatteryManager which provides the value of instant battery temperature, but is there an actual ...
15
votes
3answers
5k views

Battery - do they last longer if recharged when empty?

I'm about to buy a Samsung Galaxy Ace (it's not much expensive and I think it's a pretty good phone), however everyone has been complaining with the battery life but admitting that isn't bad compared ...
14
votes
2answers
3k views

When should I start charging my Lithium battery?

The comments in this question say that I shouldn't wait until low battery charge level before I charge, because that reduces battery life (this is contrary to my understanding before that the faster ...
13
votes
3answers
10k views

What's the meaning of signal strength colors in battery usage screens?

The battery usage screen has an indicator for "Signal strength" that, instead of being blue/black like WiFi, has many colors: green, gray, yellow. What's their meaning?
13
votes
1answer
2k views

charging from power outlet or computer? to save battery lifetime

I realized that charging my HTC Desire (Android 2.1) takes longer if connected to computer compare to power outlet. Does it matter which method I use to charge in terms of battery life time?
13
votes
6answers
1k views

How can I improve the battery life on my device? [duplicate]

Possible Duplicate: What can I do to increase battery life on my Android device? My Desire is absolutely great, but with my usage the battery life is really a big problem. I have a few ...
13
votes
5answers
15k views

Mediaserver using excessive CPU time and battery

I've got a Nexus 4 on OS version 4.2.1 that suddenly started to drain it's battery very quickly. When looking in the battery usage I see "Mediaserver"eating 60% of the battery over time, with several ...
13
votes
4answers
9k views

What's causing battery drainage by “Google Services” while packet data is switched on in a 3G dead zone?

Here's a picture of my Samsung Galaxy S2 battery usage page. Around the point where the battery usage started diving, I had added a calendar remainder, sent an email (to a new contact) and browsed ...
13
votes
3answers
42k views

How can I find out what causes “Android OS” to consume battery?

The issue is that I see a high percentage on the "Android OS" item in the Battery Usage, and I want to find out what is causing it. But let me say that I'm interested in diagnostics techniques and ...
12
votes
1answer
934 views

Which method of wireless tether uses the least amount of power? Bluetooth or Wifi?

If I'm going to wireless tehter to my Android phone what method drains the battery the least? Wifi or Bluetooth?
11
votes
7answers
6k views

Power saving tips for Galaxy S2 that don't involve turning it into a dumbphone

My Galaxy S2 has always shown not more than 8 hours of battery life. This is with the stock ROM, as well as the recent 2.3.5 update and a rooted kernel. All the battery saving tips I've seen ...
10
votes
7answers
4k views

What effect does tasker/locale have on battery life?

Locale and tasker look pretty cool. How much effect will they have on battery life?
10
votes
3answers
6k views

How frequently is it okay to let the battery discharge fully or as low as possible?

I know that atleast once or twice a month a full battery drain and then a 100% charge helps increase the battery life and also gives more accurate battery readings. I was wondering, how frequently is ...
10
votes
4answers
691 views

Gingerbread has drastically reduced my battery life

I have a Nexus One, and since upgrading to 2.3.3, my phone lasts several hours less compared to 2.2.x. I've swapped out to a new battery, which didn't make a difference. In about 14 hours (of nothing ...
10
votes
2answers
11k views

Google Services is killing my battery by keeping phone awake

In the last few days my Galaxy S3 has gone from lasting 12-13 hours to about 6 hours. On checking the battery monitor it seems to suggest that the phone is constantly staying awake and that Google ...
9
votes
4answers
310 views

Does GPS signal quality influence battery life?

Does bad/weak GPS signal affect battery life? For instance, when in the city downtown with lots of tall buildings or in the woods or mountains, will running GPS drain the battery faster?
9
votes
3answers
16k views

2G versus 3G: Does it really save battery?

I often hear the recommendation that fixing your device to 2G saves a lot of juice compared to using 3G. Is that true? Or is it really a myth?
8
votes
4answers
4k views

Battery level indicators: Do they consume more battery?

I have a Samsung Galaxy Y phone, the battery level indicator that comes pre-installed in the status bar, shows only a graphical representation of the battery level and does not gives a number ...
8
votes
4answers
3k views

Will constantly having Bluetooth on drain my battery too fast?

I'm thinking about making an app which will require Bluetooth to be available at all times. However, if this reduces battery charge life significantly, then that's kind of a show stopper. Can anyone ...
8
votes
2answers
1k views

Is there any study on how which services/sensors consume the battery?

I am looking for some study/comparison on how battery-consuming are specific services/sensors (3G, Wifi, GPS, Bluetooth, accelerometer) in Android devices. I know that the exact answer might differ ...
8
votes
2answers
1k views

Power draw from GPS - Does granularity affect amount of power drawn?

We all know that GPS draws a considerable amount of battery power. Does anyone know of any studies that test the "granularity" of a GPS signal with how much battery is consumed? I'm not talking ...
8
votes
2answers
224 views

Avoiding power drain

I just got a samsung Indulge this weekend and I’ve noticed that the biggest power drain on the battery is from the display. I’m blind, so I really don’t need to be able to see it at all. Is there a ...
8
votes
2answers
679 views

Easiest way to reduce power consumption to phone only

Sometimes I'm in a situation where I can't charge and want to have phone service as long as possible. I won't care if nothing else is enabled. What's the easiest way eliminate as much other power ...
8
votes
2answers
2k views

Turn off cellphone (SIM) radio

How do I turn the cellphone (SIM) radio on an Android phone? The radio consumes a lot of power (30-70%), especially when the phone is idle. Sometimes I only need to use other functions (e.g., clock, ...
7
votes
5answers
741 views

Enabling GPS flag on android preferences: what is the battery impact?

Even if there are many questions regarding Android and GPS my doubt is really specific to the user level location settings. Supposing I've enabled the GPS settings, say from the Power Control widget, ...
7
votes
3answers
3k views

Do battery saver apps really work? Is it possible to save battery programmatically?

There are numerous apps in the Google Play store claiming to double or triple the battery life. Is it just a myth? Or can they really? If they really do save some power, why doesn't Android do it by ...
7
votes
2answers
2k views

What uses most power: GPS or WiFi?

When playing Ingress I find that both GPS and WiFi (each by themselves) provide an acceptable location accuracy. My question is what draws the most power? I'm interested in technical information ...
7
votes
2answers
6k views

Does disabling 3G while having WiFi save battery?

If I have WiFi enabled and 3G data disabled, does it save any battery relative to having both WiFi and 3G enabled? With WiFi enabled, I didn't know if 3G enabled would make any difference since it ...
7
votes
3answers
393 views

Is there a way to tell when the battery is actually at 100%

I recently acquired an HTC Desire Z / G2, and installed Cyanogenmod 7 onto it. Something I've noticed though is that sometimes the battery drains very quickly, and sometimes it does not. Since I have ...
7
votes
3answers
2k views

Why has my GSIII's battery life dropped from 50-60 hours to 16 hours?

I have a GSIII (Sprint) running Android 4.0.4. In the last three days, I have not made any changes or installed any new software that I know of, but my battery life has dropped such that my phone, ...
7
votes
2answers
765 views

Faster CPU means higher battery consumption?

A friend of mine and I have the Samsung Galaxy Tab 10.1. His tab is flashed with a custom kernel giving 1.2Ghz instead of the 1Ghz I have by default. Using antutu benchmark, we saw what we expected, ...
7
votes
2answers
18k views

How do I recalibrate the battery of my phone?

After a year using my phone, I noticed the battery drains too fast, but after shutting down I manage to make it work again for a couple of minutes before it shuts down automatically. I read that to ...
7
votes
2answers
2k views

Am I overcharging my phone? [duplicate]

Possible Duplicate: Does constant charging harm my Android cellphone? I am using my Xperia Active for application development. Given that scenario, I obviously have the phone connected to ...
7
votes
2answers
537 views

What determines power management policies in Android?

I am just approaching to the Smart Phone and Android world and have a couple of doubts: Which modules (and SW or FW?) decide the policies with which power is given to any component of the Smart ...
7
votes
1answer
529 views

Is it normal for Android System to be the top battery user?

Over the past couple of days, the battery usage of my new phone has been as follows: 34% - Android System 28% - Cell Standby 21% - Phone idle 10% - Display 03% - Google Goggles 02% - ...
7
votes
3answers
320 views

How can I tell why my sleeping phone occasionally gets warm (and battery is draining abnormally)?

My two Android phones are doing the same thing, Motorola Milestone and Samsung GS3. From time to time, it is sleeping in my pocket and it will start to get warm and the battery is then draining quite ...
6
votes
5answers
13k views

Is there an app that will drain my battery?

Are there any apps that will specifically help to drain a battery down quickly? The scenario I would want to have this is if I want to quickly drain the battery so I can charge it fully again. Some ...
6
votes
2answers
1k views

When the GPS is enabled but not in use, does it drain battery?

If the GPS is enabled (in the notification view at the top, the GPS icon is enabled), but the app doesn't use it, does it drain battery? I understand that GPS drains battery because it requires a ...
6
votes
3answers
3k views

What kind of power saving smarts does Android already have?

I just d/l tasker and it's been really interesting (although not as interesting as I would've liked since I feel a lot of the good features require a root). I would like to optimize my Galaxy s3 so ...