Complete battery monitoring with notification icon, history, graphics and alarms
Tested on Galaxy Nexus, Galaxy Note, HTC One X, Iconia A500, Transformer all under ICS: 
Consumes < 3 seconds of CPU per day using default (recommended) settings.

The most complete tool to manage your battery: Shows historical data (%, mA, mW, mV and temperature), 
calculates estimated run-times and battery aging, helps calibrate battery and improve your battery run-time.

NB:

    NOT all phones report accurate mA - Check app web-site for more information
    The app displays the % remaining, voltage and temperature data reported by Android OS
    HTC One X reports incorrect mA during standby, use mA corrections for better results
    Android battery stats have nothing to do with % calculations

Measures real battery capacity using historical data!

Display all information using great looking graphics, fully scrollable and zoomable.

Use additional packages to show great looking icons in notification bar

Display historical graphics or battery data on your home screen using widgets of various sizes!

Triggers alarm based on battery data (voltage and temperature limits)

Manually resets battery calibration/statistics on rooted phone

Support Motorola Defy/Atrix 1% reporting

Online help accessible from settings

Export data to System Tuner Pro to analyze which process is responsible for battery drain!

Lowest battery consumption on the market! Disable history/graphics for even lower consumption! 
Check web-site for app consumption and supported phones.

What's in this version : (Updated : May 21, 2014)

    Add warning before accessing manufacturer's test screen
    Fix delete all markers in detail view
    Fix widgets secondary graph options
    Requires INTERNET permission to download external notification icons
    Requires SYSTEM_ALERT_WINDOW (draw over other apps) to show a battery notification bar

Required Android O/S : 1.6+