I posted these in the Liberty ROM forum but I'll share them here as well. I'm assuming that everyone has already created and posted their own Liberty inspired circular battery icons. I thought I would share the set that I just created. Even though I made them for Liberty, they have transparent backgrounds and will look good on any dark notification bar. I did 0%-100% in 10% increments as well as all the charging animations and the "Battery Status Unknown" icon (even though i've never seen it).
See below for the .zip of all of them with correct filenames. As with all battery icons, they all belong in \framework-res\res\drawable-hdpi\
If you would like to edit them, PM me and I can send you the .psd file