I need to replace a battery for my Macbook Air 13" mid-2011. There is no Apple's own repair service where I live, and I'm fairly savvy with electronics to do my own repairs.
How can I identify batteries for sale that are either genuine Apple parts or determine if alternative replacement batteries they are at least equal, but preferably better than, the original MacBook Air battery I have.
By "equal or better" I mean that it lasts at least as many cycles. I.e. after equal number of charges, it keeps Macbook running roughly as long as the genuine battery on a single charge, given the equal load.