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1.6 or 1.8 GHz dual-core processor, 2 GB or 4 GB of SDRAM, 64 GB or 128 GB SSD

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How do I change battery?

how do I install new battery

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Here’s the iFixit guide MacBook Air 11" Mid 2011 Battery Replacement which is one of many which you can find here 2011 MacBook Air repair guides

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Rikers Pharmakopoulos crwdns2934231:0crwdne2934231:0
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