JuiceDefender saves battery power (lots of it!) by controlling the device data connection and/or WiFi.
You can schedule regular APN/WiFi activation to let background data sync occur and have APN/WiFi enabled while the screen is on. It also helps in minimizing distractions.
The Easy Mode is a no-fuss one-click way to let your battery last longer - much longer
intelBat - A battery monitor for Android. Determines the location of the phone when it is charging. When battery falls below a set level, it checks if the phone is in proximity of a charging location, and sends out an alert if it finds one.
The app detects the location using WiFi signals only. It does not use GPS/Cellular data
JuicePlotter is a battery usage graph that combines full at-a-glance information about your battery consumption with sheer beauty.
The coloured bands along the graph show your screen brightness, radio usage, charging status and battery temperature. Just scroll around to find precise information and make sense of the different colours
Android Battery Dog - Simple service for Android for long time monitoring of the battery level. A log file in csv format is created /sdcard/BatteryDog/battery.csv which contains timestamp and all available battery info, like level, temperature and voltage. Includes simple graph
