[dcperdue]

Never use aftermarket batteries in your device.

The oem battery has a chip inside it that relays information to the phone. Which is the reason your phone is not giving you any information about the battery, It cant because there is no chip. Thats the reason the oem battery costs $$.

Other reasons you should not do it is because if that batter is off spec even by a little but it can brick your phone or even EXPLODE!