[Samsung Galaxy Nexus] Tubes6al4v:
This guide is a work in progress,

please contribute to it so we can have a central place for battery info!

Table of Contents:

1. Quick Tips

2. Monitoring Battery Usage

3.The Nitty-Gritty Details

4.Frequently Asked Questions

5.References

6.Changelog

Quick Tips

NOTE: As with many devices in their early days, there seems to be a few bugs needing to be worked out. Some of which include:

High "Android OS" Battery % usage. Possible remedies include settings->Wifi->Advanced(menu)->Keep Wifi on ALWAYS when sleeping; Trying alternative kernels from the dev section; although 4.0.3 may have some improvements, early leaks are not yeilding substantial changes.

High "Media Server" battery % usage when using a media app with audio, video, etc.

High Preset voltage table in kernel can be fixed with UC Kernels, but proceed cautiously.

http://code.google.com/p/android/issues/detail?id=22878

Battery Capacities.

NOTE: The batteries are NOT interchangeable between GSM and LTE!

GSM: 1750mah

LTE: 1850mah

LTE extended battery: 2100mah

GSM extended battery: 2000mah

Settings that use us battery:

Screen brightness: Using the lowest comfortable setting will save a good bit of battery, espescially on such a large screen. App LogGraph can be used to change auto-brightness levels

Haptic feedback: Switch this setting off (Settings->Sound->Vibrate on touch). You may need to turn this off in alternative keyboards. Vibrations on button press, unlock, etc will use power for the vibrating motor. This includes vibrating for a call or text.

Button Sounds: Switch this setting off (Settings->Sound->"Dial pad touch tones"; "Touch Sounds"; "Screen Lock Sounds"). Speakers are small electro-magnets and require energy to move, consuming a small amount of power.

Sync: The more frequently your apps sync the more energy will be consumed. Turn off unnecessary syncs and reduce excessive syncing (Settings->Accounts & Sync->...) Alternative apps such as Juice Defender and Tasker can be used to control sync settings. Some ROMs are now incorporating this feature as well.

Antennas: The short of it: Use Wifi as often as you can, it scans for a connection less often than mobile data. BT, and GPS antennas use very little power when idling. This is the most often confused aspect of battery life. Read more in the "Nitty Gritty" section.

Live wallpaper: Requires greater CPU usage to run, and currently ICS lags in this CPU processing, as demonstrated when switching an older phone over to ICS and finding lag in the wallpaper.

Widgets: Higher refresh rates, sync intervals and greater changes in the widgets will consume energy more rapidly.

AMOLED Screen consume less power when displaying black.

Auto Rotate uses greater CPU and changes screen.

Apps for reducing battery usage:

Juice Defender - Very easy interface for switching wifi/bt/3g/etc on and off to save battery. Great first start.

WARNING:

Some users report greater battery consumption when USING juice defender. This may be due to certain settings they have or the app itself.

Tasker -Much more advanced, and less user friendly application for automating processes on android. Can be used to closely control the behavior of your phone.