What you need
1 x Sony (original) battery
1 x replacement battery for your PSP
1 x small pin
1 x 512mb memory stick
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Signing UpStep 1Taking apart sony battery
Be careful not to cut yourself or to dig to hard into the side of battery because there is chips in it and you should not damage them. (not sure what they do, but do not damage them).
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http://www.instructables.com/group/PSPHacks/
so when the battery charger charges the battery, and sees that the battery is at 4.2v, it shuts off
cutting the trace might be a good idea.... but i don't remember if you could, the trace might go under the chip, or something....
if you could cut the trace, you could bridge it back with solder, but you would have to scrape the green 'stuff' epoxy off of the circuit board