Wattagio is powerful battery assistant. It informs you about current battery health and helps to decrease power usage. Flexible settings in application give options to customize your profile to meet your needs.
A simple software to help you monitor your PowerBook’s battery and temperature
A Dashboard widget that displays battery status.
View the current battery status of your laptop
Free Yahoo! battery widget for your Mac
Free Yahoo! widget that shows your battery status
iStat battery is a simple widget to monitor your laptop’s battery with a striking design and two different views.
batterystat – The missing commandline tool to get battery status information on Mac OS X.