Battery Monitor is a battery monitor for laptops. It displays the current status of the battery (charge/discharge and energy level) as well as some information about the general health of the cell. . Due to the way Battery Monitor is implemented it currently works only on linux 2.6 kernels with ACPI and that too reliably only on some acpi/bios combination (it is being worked on: the /proc file system is very inconsistent.) A user-contributed patch to make it work on FreeBSD has been merged in.
