The official battery for my PSP-2000 became swollen so I ordered a replacement. The replacement is a 3rd party product and works fine for the most part. However, sometimes it would turn my PSP off from sleep mode if the charger is plugged in, and when I turn on the PSP again I find that it is unable to detect the battery. I would have to fiddle with the battery a little bit in order for it to work again. I did a bit of testing with it and eliminated a few possibilities: It doesn't seem to turn my PSP off from sleep mode if the AC adapter isn't plugged in. The battery charges just fine if I don't put it to sleep mode (let the screen black out in xmb loader) I tried using another replacement battery, and that one doesn't have the problem mentioned, so it's not likely to be a hardware problem of the PSP. (The problem with that other battery is that its battery life is pitiful even though it advertises 3600 mah) Any tips on how I might fix this? Any further tests I should run? I'm quite sick of trying out different batteries only for them to not work but do you guys have any recommendations for replacement batteries if necessary?