Need Help for Slim Psp

Yeah need help with turning my friends Slim Psp to CFW. But I got a few questions.

I have already may my phat into a 3.71 M33-3, and I'm used to that. I just need to know if I can un-pandora a battery after I used it, and whether or not the slim can run iso/cso or popstation generated eboots. (Not sure if those are legit questions but meh, just wanna know if it can)

Also, I've heard that Slims can be un-bricked?

Yes you can turn battery back into a normal one after use.
Yes the slim can run ps1 games created with popstation, The iso/cso question i cant answer cos of forum rules.
Yes Slims can be unbricked.

NOTE- You MUST use despertar cementario v3 or v4 for slims when installing custom firmware or unbricking.

As per hodgy47 mentioned, all these things are possible.

Please refrain from mentioning CSO/ISO in this forum :) You'll have the forum police after you and oh my they are nasty.