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I wouldn't trust or recommend any non-Apple battery or charger, due to the number of problems reported with "knockoffs". Also, there is no assurance that non-Apple components will have the same charging technology that Apple uses, involving the battery, the MagSafe adapter and the Mac's logic board. Apple has not licensed its MagSafe adapter technology to any 3rd party. It's not worth risking your Mac to save a small amount of money.
The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.
 
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