I added a little big at the beginning to show an easier/safer/quicker way to make the battery, this way doesn't always work though, where as your way does, so I left your up.
I learned this from a guy on QJ that posted in a thread I made when my PSP battery suddenly broke itself, he suggested that I short the - and +, so that worked, than I messed around with it a little bit and found out that the middle and + pin makes a pandora's battery.
__________________
|