The plugin shows some useful info about your PSP's battery status. Users be warned that the plugin was developed only for custom firmwares and was specifically tested on M33's Custom Firmware 3.52. The developer also warns users not to flash the PRX. Here's the developer's notes:

What It Does:

* Shows you battery percent left
* Shows you battery time left in minutes
* Shows you temperature of the battery
* Shows you the current CPU speed

Controls

* L Trigger - Hide/Show the PowerWatch Information