The psp goes through a firmware and then a software mod to make it what they call "modded" I personaly have heard of no battery mods besides the LED's and other cosmetic changes, In other words no hardware change, just software. Also please not that there are several different versions of the PSP out there now and not all of them have the same capabilities.
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modded controller
it is possible by modifying the server.jar file with the modded class files from the mod download.
It's only possible to turn on your PSP with an adapter for the PSP or a battery for the PSP.
Moding the PSP means to make you PSP be able to play games you downloaded from the net.After modding, you can download games from the internet and store the games in your memory card and play the games from the memory card without the need of a UMD disc.There are currently quite a few versions of mod available and it depends on your PSP model which MOD is more suitable for your PSP.
You can run a PSP without it having a battery, it's not very convenient though. It will only operate while it has the charger in.