wmbatppc displays the status of your laptop's battery in a dock icon, and features an On-Screen Display to remind you of the battery state. This is aimed at PPC laptops, suchs as iBooks and PowerBooks G3 or G4 ; laptops with two batteries are supported.
A command-line utility called batppc is also provided to access battery information from the console.
The status infos include the charge of the battery, the voltage, whether your laptop is plugged in or not, whether the battery is charging or not, the time remaining (both use and charge) and the level of the battery (it indicates the level of each battery if your laptop has two bays).
This package suggests pmud which can be used as a source of information.
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