Need recommendations for a new PSP battery.

My original battery doesn't hold a charge anymore; I got a replacement that worked well for about a year, but has suddenly burst inexplicably (it was fine last night, shouldn't have overheated). The replacement was an official Sony battery, since I had trouble with all the knock-offs I tried, and I can't seem to find any now with good reviews on Amazon.

I currently have a 2000-series, but also have the extended door to use the larger batteries if necessary. Any fellow PSP users have any suggestions?