Hey dont use the official wall charging station for PSP on your slim battery. If you do yours might not work afterwards.
Stick to usb and a/c chargers, dont use the charge station.
I assumed since the old battery worked in the slim that the old charger might work on my slim battery.
well it works in the way that it destroys them so if thats not your intention id suggest staying far away from these things.
I like to leave mine at friends houses so i dont have to carry and cables.
Good luck and enjoy your slim cuz IM FREAKING OUT. THEY FIXED EVERYTHING. PLUS SO MUCH MORE!! PSP OWNS ALL NOW!!
sorry 'bout that...