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Most robust and lasting replacement battery for Macbook Air 2011

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.

I assume that Apple is very unlikely to allow any retailer to sell Apple's genuine battery for Air. What manufacturer makes the most robust and lasting replacement battery for MBA 2011; what is its product ID (or how can I identify it otherwise, especially if ordering online)?

By robust and lasting I mean that it lasts 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.