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I'm trying to change the battery in a MacBook Air 11″ i7 1.8 GHz (July 2011) MD214LL/A.

I found this Runpower battery, which is 39Wh.

Yet when checking the specs mentioned above, the battery is a 35Wh.

If I change the battery to one with a higher Wh, will it have a negative impact or will it be ok?
Can I safely buy and install the new battery?

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The battery you want to buy should be fine (in terms of the specs and compatibility). The 39 watt hours basically means that on a full charge it should last longer than a 35 watt hour battery (about 11.4% longer). Many after market MacBook batteries do usually offer a little more capacity in that regard.

As for the battery itself, I've never used that particular brand, so cannot vouch for its quality. However, since it seems to have a 5 star rating, it looks promising. As long as it offers a decent warranty (I can't read French, so can't tell), I'd buy it.

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  • You can just change the domain from amazon.fr to amazon.com for the English version. – grg Mar 13 '17 at 9:10
  • Update : Thanks for your answer. I did change the battery and it is now working like it used to. Cheers – Andy K Mar 24 '18 at 13:36

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