Lithium is a Panel Applet that displays an icon indicating the Charge/Discharge status of your laptop's battery. Status information is also displayed in a tooltip. Lithium will use libnotify for the power-level warnings if you have it installed (with python support).
Lithium is a rework of the Baroque applet written by Rds and Tilo Riemer. It is functionally almost the same as Baroque, but the UI has changed quite a lot.
Lithium also includes acpi.py and apm.py that are used by Baroque instead of requiring them to be downloaded separately. In addition, pmu.py was added to support PowerMac users (Me).