Rephrase your question please. To me it seems like you're asking where to find Pandora batteries if they don't work, which seems pretty odd.
And yes, you can install M33 given that the PSP model you're hacking is a 2000 model manufactured before the end of summer '08 or a 1000 model. No recent PSP-2000s or 3000s can be hacked at the moment.