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Hi, I think the guy above is thinking of the andida batteries which i personally have used and seem to be very reliable and offer as close to possible there 2000mah recommendation, you wont get 50% more battery life as its physically impossible for the size but the andia batteries will offer a bit more than other cheaper alternatives:
There is this seller on ebay:
Andida Battery For Samsung Galaxy S2 I9100 2000Mah Replacement High Quality! | eBay![]()
I think its the same seller so price is the same, Hope this helps!