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

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5
votes
1answer
2k views

Should I disable mobile data while I'm connected to WiFi?

If WiFi is activated, the phone expends energy trying to find WiFi connections, even if I'm not using the internet. Is the same true for mobile data? Does the phone expend any energy trying to keep a ...
33
votes
1answer
72k 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 ...
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 ...
2
votes
1answer
4k views

Power Saving Option in Samsung Galaxy S3

I see there is a Power Saving switch in the Galaxy S3. What makes the Galaxy S3 save power when it is turned on? Is there a difference this and using JuiceDefender? Can using JuiceDefender and ...
6
votes
1answer
191 views

What happened to my detailed battery stats on my Asus Transformer Pad?

I have an Asus Transformer Pad tablet (TF300T). As with any other Android device I've owned, when I go to the settings menu and tap "battery", it gives me a detailed break down of which apps and ...
6
votes
1answer
497 views

Will charging a smartphone while it is in a case lead to damage? [closed]

Will it harm my Razr to charge it while in an Otterbox case? I heard that would cause excessive heat which would damage the battery or shorten lifespan. True?
3
votes
1answer
210 views

What way of controlling volume is more battery efficient?

I have a headset with it's own volume control, and I can also control the volume of the music through the android's volume control keys. But which way of controlling is more battery efficient? ...
61
votes
4answers
66k 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.", ...
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 ...
0
votes
1answer
163 views

Can any Android device be set to not auto power-off?

If I buy any no-name Android tablet from ebay etc, is there a chance it will not allow me to force it to stay on all the time? In other words, is "never auto sleep" a universal feature of any android ...
5
votes
3answers
212 views

Configure power control in notification pane

I just bought an Alcatel One Touch 995 with Gingerbread 2.3, when I display the notification the notification pane I have some icons I can click to activate GPS, wifi, bluetooth, rotation... I know ...
4
votes
1answer
145 views

How can I monitor the device battery consumption?

I need information about which applications or hardware features discharge the battery. Built-in Android option for this doesn't fit because not all devices have it. Also it would be a great advantage ...
1
vote
0answers
192 views

Poor battery after update to Android 4.0.3

I updated my non-rooted Samsung Galaxy S2 from 2.3.5 to 4.0.3. Now, I recognize a significant decrease in battery lifetime. Any idea what may cause it and how to get around it?
7
votes
2answers
767 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, ...
3
votes
1answer
9k views

How can I boot my Nexus S with a broken power button? Can only boot to “Do not turn off target”

My Nexus S power button has stopped working and Samsung will not honor the warranty. The farthest I've gotten is to the Downloading screen with the yellow work ahead sign, that says "Do not turn off ...
4
votes
1answer
3k views

Get rid of 'battery-low' popup after some delay?

I'm using an Android phone (a Motorola Defy+ running CM9) with OsmAnd as a map solution mounted on my motorcycle (it just shows the map and a gpx-track as a driving hint). It's not connected to a ...
0
votes
1answer
641 views

Can I prevent ICS browser from using CPU while in the background (without back-button exiting)?

I'm running ICS 4.0.3, and I notice if I have the Web app (default browser) open, but not in the foreground, it still uses a lot of CPU (25-50%), based upon the built-in Android Task Manager. Other ...
4
votes
1answer
4k views

Battery life cut in half recently - DrReadUsbStatus issue?

My regular uptime on Samsung Galaxy S2 was around 6 days. For the last couple of weeks it is down to less than 3 days. The change was instant, but I was hoping it would come back - it did not. Running ...
3
votes
1answer
481 views

Minimized Apps: Do they consume more battery?

If I keep one or more app minimized in my Android Phone (Samsung Galaxy Y) will my mobile's battery will be consumed faster than if I had not minimized any application at all?
2
votes
1answer
364 views

Is there a reason Google Reader drains this much battery?

It doesn't strike me as normal that Google Reader should drain more battery than even my screen. Is this a known bug, or is it a settings issue? I'm using 4.1.1
2
votes
1answer
2k views

Why does my myTouch 4G lose battery so fast?

So I formatted my phone today. I have not used it, and it was at 100% this morning. No apps installed, the screen was only on for about 10 minutes. Yet when I go to check it now, about 12 hours later, ...
1
vote
2answers
437 views

Power being eaten by screen usage

This morning, when I woke up my phone was out of battery power. So when I checked the battery usage I see the message Display had been used 90%. This kind of situation had never happened to me ...
2
votes
1answer
270 views

What factors does PowerTutor measure to show energy consumption?

I am trying to find the impact of the signal strength on the energy consumption of WIFI in Android using an HTC NEXUS ONE. I am sending several files starting from 1 kb to 600 kb. I use PowerTutor as ...
-1
votes
1answer
120 views

Is there any equivalent of Tegra 3's “-1” low-power core in Qualicomm's S4?

One of the reasons I greatly desired my next phone to be a Tegra 3 "4+1 cores" device was the (somewhat less advertized) 5th low-power core designed to prolong battery life by running low-power ...
3
votes
1answer
96 views

Why are individual apps not listed in my battery usage statistics?

I'm using an Asus Transformer TF300 running Ice Cream Sandwich. When I check Settings->Battery the only things listed are Screen, Tablet Idle and Wifi. Why aren't apps that I use being shown in ...
1
vote
1answer
187 views

Why does my android phone gain battery when I turn it off and on again?

When I got my new android phone (ZTE N762), I noticed something. If my phone is about halfway on battery, and I turn it off for a few hours, it will gain battery life when I turn it back on, around ...
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 ...
0
votes
1answer
270 views

App to show battery current or rate of change of voltage, short term info

Id like to have quick feedback about how what I do on my phone affects power usage, but cant seem to find a good widget or app for that out of the hundreds out there! Anyone know any? Thanks
3
votes
2answers
5k views

Galaxy S3 cell standby is eating my battery

My battery on my new S3 seems to be being eaten up by the cell standby using more than 50%. I appear to get a decent signal on the phone. Does anyone have any idea why this figure would be so high?
2
votes
1answer
2k views

How can I increase my Samsung Galaxy Tablet 10.1 battery life?

How can I increase my Samsung Galaxy Tablet 10.1 (Android) battery life? I am going to use my Samsung Galaxy Tablet 10.1 (with WIFI and/or 3G) for marketing purposes: It's going to play a movie non ...
2
votes
2answers
264 views

Power saver turns display brighter. Shouldn't it be darker?

When my battery is running low, the power saver turns on. When that happens, my display gets brighter. Shouldn't it be turning darker to reduce the power consumption? Is it normal to get brighter or ...
2
votes
1answer
2k views

What does “awake” mean?

I obsessively check the battery info on my ICS phone, and I've noticed that I get the best battery life when the phone hasn't been "awake" much. But I realized I don't really know what "awake" means. ...
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 ...
5
votes
3answers
9k views

Will rooting my phone improve its battery life?

I've had an HTC Desire HD with HTC Sense for about a year and I'm quite happy, except for the battery life. After upgrading to the latest version, it lasts about 24 hours with moderate/low usage. I ...
2
votes
1answer
492 views

How to train the battery

I am trying to find the way to use my battery in the most efficient manner. I found several suggestions how to achieve the longest life of the battery, and one of these suggestions is quite strange ...
7
votes
2answers
539 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 ...
1
vote
1answer
98 views

How can battery usage of Android be at 79%?

Till last night everything was kinda balanced.....most of the different parts of the usage were in between 20-35 %, but this morning after having activated the internet from my network provider, it ...
3
votes
1answer
80 views

Can anyone explain to me what the % really refers to in the Android system, battery usage?

I am wondering what the different percentages really refer to in the battery usage section. I mean...in total I see more than a 100%. So it is easy to presume that it doest mean a certain percent out ...
1
vote
1answer
123 views

Latest Motorola update burns more battery on RAZR phone idle?

I had my Droid Razr tuned pretty well to give me 10-12 hours of use without going below 70-80% of battery life. Since the update to 6.12.181.XT912Verizon.en.US (GB 2.3.6), I'm now down to 40% in the ...
4
votes
1answer
722 views

Is there any reason not lock the CPU frequency to the minimum while the screen is off?

To save battery, I have created a "screen off" profile with SetCPU that locks the CPU frequency to the minimum while the screen is turned off. Could this have any negative side effects on apps that ...
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 ...
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 ...
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 ...
1
vote
1answer
373 views

How much does an LCD's backlight drain the battery?

The screen tends to be one of the biggest consumers of electricity. How much of this is for the backlight vs the actual screen, particularly in the case of an LCD?
2
votes
1answer
450 views

How to stop display turn on and consuming battery power, when using Headphones remote control or volume button?

I don't know if this depends on the music player (I'm using mort player music) or standby screen (I have widgetlocker app as lockscreen), I don't see any options in these apps to change this. In ...
5
votes
1answer
167 views

How to check how much battery the data network is using?

How do I check how much battery the data network is using? When I enter Settings->About phone->Battery usage I get the following: Voice calls Android OS Display Android System Dialer Cell ...
6
votes
2answers
484 views

Battery life depends on type of charger

When I charge my HTC Sensation mobile with the charger supplied by HTC the battery duration is more or less 1 day (depending of the usage). But (here comes my question) when I charge the mobile ...
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 ...
5
votes
1answer
675 views

Save battery by switching to 2G after a few minutes of inactivity

I'm looking for an app that'll switch to 2G only after a few minutes of inactivity. The idea seems simple enough, but I can't find it. JuiceDefender just disables the data connection, and re-enables ...
2
votes
1answer
965 views

Battery Sony Ericsson XPeria Mini Pro

I've a Sony Ericsson XPeria Mini Pro with Android 2.3.3. I noted that the battery ends really fast. I don't have enable GPS service, Mobile data, Bluetooth. Only phone and wifi. In less than two days ...