MyBattery for Mac

From Jeremy Kezer:

MyBattery is a utility program designed specifically for portable Macintosh computers. It provides you with information about your PowerBook batteries and system. Its features include:User-customizable display. You decide what information you want to see. Displays information about internal batteries, including charging status, charge level and battery voltage. Estimate of useful battery time remaining. It uses a historical estimation that "learns" from your PowerBook usage patterns. Displays power-related system information like hard drive status, AppleTalk status, and modem status. History window which displays recent battery charge history. Support for multiple batteries, accommodating different capacity batteries. Menu bar displays, for easy viewing of battery status and other system information. MyBattery's most popular feature is its ability to estimate how much battery time you have left. Using a historical estimation technique, MyBattery monitors your PowerBook usage, and updates its estimates accordingly.