Did you cut the battery, or did you just use the Easy Pandora Installer?
If cutting is the case, you might have touched something that connects the batt to the PSP. It doesn't need to be cut to have the batt not work.
OR it's just too old.
EDIT : Nah, you did something with your psp that can't read batteries. 2 options:
1: Buy a new PSP.
2: Use the PSP with the charger, but that's annoying.
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