Hi I've had the same battery on my PSP 2000 since I bought the PSP 2000 in 2007. Never had to replace it. Recently though I've noticed that UMD games last an average of slightly over 2 hours while games on memory stick last about almost 4 hours. I know I use to get more than that. Recharging lasts longer now as in 4 hours and sometimes longer. Before it would take about 2 hours. I never modded the battery or anything although maybe the habit of leaving the psp in sleep mode all these years could have caused it? I used the PSP a lot in 2007, 2008, 2009, 2010. Around 2011-2013 was when I barely used and barely charged it. Now I'm using it again. And yes I'm aware that lithion batteries do lose charge over time. I already completely drained the battery until the PSP shuts off by itself and charging it. Same result. I did this similarly on my Nokia phone where it wasn't holding a charge as it used to for some reason and completely let it drain and charged it and somehow it worked again. But it wasn't the case with the PSP 2000 battery. Could it be memory battery issue or is it time to replace it? Any other possibilites to fix it? If not it's no big deal. Will an Official PSP 3000 battery work on my PSP 2000? I'm leaning towards this since it sold a lot: http://www.ebay.com/itm/USA-SELLER-...t=US_Video_Game_Batteries&hash=item43b93f4629 I'm also aware of the cheap $5 batteries from China and I'm avoiding that. A third party brand that caught my attention was the Lenmar brand which is also available on Best Buy although I can get it a bit cheaper on ebay, amazon, etc as well as the brand being more common as of late: http://www.bestbuy.com/site/lenmar-...47&st=categoryid$pcmcat147700050041&cp=1&lp=1 But Lenmar only has 1000 mAh instead of 1200? I'm not confident on that. Last but not least I don't care about the extended battery. I was fully satisfied with my PSP 2000 battery life years ago.