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To simplify some things, you can just buy a regular/pandora battery from dxhttp://www.dealextreme.com/details.dx/sku.15153There are a couple more of those on the site as well
http://www.psp-hacks.com/2009/01/16/pspnokia-battery-hack-job/You could try modifying and using a cell phone battery...Dunno, just throwin' out ideas.Like the idea, can't wait til your done with this.Good luck!