i've put a video on youtube how to do a pandora on a slim without the use of a soldering iron
note: to use this battery again the only way is to use time machine
heres the vid
http://www.youtube.com/watch?v=fVqVpvCo-3oand heres the description :
this is a guide to mod a psp battery and memory stick to a pandora's.
not as hard as it looks, easy and noob freindly
1)Turn on the psp
2)Format the memory stick
3)Go into USB mode
4)Next, go here:
http://dl.qj.net/TOTALNewbi-easyInstaller-PSP-Tools-Utilities-%28on-PC%29/pg/12/fid/14749/catid/193At the bottom, select download
6)Extract the application to your desktop
7)Run "Start.exe"
8)Follow the instructions until you get into the installation screen
9)When there, you can select to install the universal unbricker (do this one!!!)
10)After it is done, your going to need to get 2 files. 1)registry 2)kd (i have a download link at the bottom for people without this)
11)Put both (kd & registry) on the root of your memery stick
12)Disconnect your psp and turn it off
http://www.pspmod.com/forums/downloads.php?do=file&id=22