I would never recommend a battery that didn't come from Apple, as too many have reported problems with 3rd party batteries. It's not worth the risk to your Mac.
This should answer most, if not all, of your battery questions:
3rd party battery from a 3rd party - OP requested only Apple. The one in this link claims 7.5 hours LONGER (!) from just a 6Whr difference. I'd just bow up and buy one from Apple.
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3rd party battery from a 3rd party - OP requested only Apple. The one in this link claims 7.5 hours LONGER (!) from just a 6Whr difference. I'd just bow up and buy one from Apple.
It's rated 1 and a half stars out of 5 as well. Get the one from Apple. Like it or not, cheap should not be used in the same sentence with replacement parts for a Apple Product.