BatteryMon is an easy to use Windows based application that allows users to monitor the performance of laptop batteries and uninterruptible power supplies (UPS).

Graphically see the charge / discharge rate
Diagnose problem battery cells with detailed statistics
Compare and measure your batteries performance with expected discharge rates
See the critical discharge point for your batteries
Uniquely identify battery packs for tracking purposes or system inventories
Log the performance of a battery for later reference
See the status of each indivdual battery pack, when multiple batteries are in use
Any laptop battery or UPS that complies with the Windows, Advanced Configuration and Power Interface (ACPI) specification should be able to report information to BatteryMon. Note that only Windows98, 2000 and ME support this interface. Windows95 and NT are not supported. Older PCs may also have a problem if their BIOS does not support ACPI. Also, some features may not be supported by some battery types.