So a PSP can be modified to work with loading games and home brew apps as you please. This will explain the step by step process in how to create a pandora battery.
What you need
1 x Sony (original) battery
1 x replacement battery for your PSP
1 x small pin
1 x 512mb memory stick
Step 1: Taking Apart Sony Battery
So you get sony battery that you got with psp and start to take it apart. slide a exacto knife down both sides of battery slowly (cutting away from you) and repeat over and over on all 4 sides.
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).
Step 2: Finding Chip
You will want to remove the leg on the top left of this diagram.
(-) # -
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Also found this video
Step 3: Download
so then just taped it all back up and plugged it back in, then the psp starts back up and running.
unplug battery again and transfer the following files onto your memory stick.
So now you do a bit of downloading
Download (NEW)(FAT+SLIM files 3.80 m33-5)
Download(FAT+SLIM files 3.71m33-2)Download(FAT+SLIM files 3.71m33-2)]
Video in last step explaines the loading of this onto memory stick much better than i could ever write.
Step 4: Loading ISO
So finally plug in second battery (not pandora battery) and then copy your ISO's and CSO files onto memory stick, put in cd into back of PSP and go to Games -> memory stick and start up game/file that you have loaded up to memory stick.
You must have cd in psp when loading otherwise you will get errors when loading game from memory stick.
If loading software you must get software that works with firmware you have.
Hope ya like this