http://filetrip.net/f25198-PSP-Battery- ... 9-1-0.html
Features:This is a PSP homebrew that helps you measure your system's maximum battery life. The brew does this pretty simply by counting up from zero and saving at 5 minute intervals for later recall (while the nyan cat does his thing). When you plug your system back in after the battery expires, the battery life, accurate within 5 minutes, will be recalled for your viewing.
Of course, some people might just want to use this to nyan away all day -- and that's perfectly fine -- maybe it's even recommended!
--It's got the Nyan Cat!
--Signed. Can be played on any PSP, hacked or not.
--Easy to use, just start it.
--Customizable . Rename any mp3 'song.mp3' (no quotes) and drop it in the 'PSP Battery Timer (nyan!)' folder for custom music. I've provided a mellow tune here as a good counterpoint to the lively 'nyan' theme. (optional song.mp3)
--In fact, you can customize anything in this homebrew, it's Lua. You have everything you need here to make your own signed PSP homebrew! Go to http://www.retroemu.com for tutorials and help.