I found some 2800 mah batteries on ebay, but they are from some store in Hong Kong so not sure how good they are, plus they are a generic name. I might still snag em just to check em out and let people know how good they are.
I would be very carefull here... Some companies might make shortcuts and improve capacity by using not so safe methods. You can read (imho pretty good) article about NiMH batteries here.
Thought probability of battery's explosion is quite but low given it would happen in your hands or face...
It's not (imo) worth risking for potential extra few minutes when just second pair of AA will double gp2x's running time.
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