The thing I've read about these batteries is they don't have a shelf life. Meaning as soon as they are made they start to depreciate. Then they sell the old ones on e bay, amazon at reduced prices as they don't last as long as a freshly hot off the press battery.
I have never had any luck in buying a extra mha rating battery, having it last an extra long time. I got Chinese 2500mah it don't last that long, and then I went and got a high capacity gold 2430mah it only last as long as a 1750mah , rather I have no idea how long normal is, as I got my infuse at a pawn shop used, battery last about 5-6 hours, normal usage, but what is normal? What is the basis of comparison? I mostly use it for movies, and wifi and, angry birds which eat my battery up.
My theory is the more you pay the younger they are, a 4 dollar batter last less then a 10th dollar battery. But I don't have the monies to buy every battery in all the price ranges to test and do all that techy stuff. To me it is just a grip shoot. Hit or miss.
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can't learn how to fix it, if you don't break it first