In this video tutorial you will see how to Pandora a PSP slim battery. You will need a knife for this. When the normal battery is in the PSP, when you switch it on, it will log on just normal. Now remove the battery, put the knife in the joint of the battery case and move it up and down and slit open the case. Then pry it open and remove one half of the case. Then flip open the flap on the battery and cut off one connection on the battery as demonstrated in the video. Now put the battery back into the PSP and it should automatically turn on.