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The larger of Apple's MacBook Air laptops featuring dual microphones and 802.11ac Wi-Fi connectivity.

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Is this MacBook Air 13" Mid 2013 Battery still safe to use?

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I used this battery rather recently and it seemed to work fine, but I just want to be sure that the (white?) dot and the slightly odd pattern in the middle left cell are anything to be concerned about.

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I always err on the side of caution with these batteries. If anything looks off, it's better to just replace - a new battery isn't cheap but fire damage from a laptop catching on fire can be very expensive and dangerous.

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It does look damaged as such I agree with Chris it time to replace. Here’s one source for the battery MacBook Air 13" (Late 2010-2017) Battery

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