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Amazon.com: A1466 Battery 【Higher Capacity 8000+mAh】 MacBook Air Battery Replacement for MacBook Air 13 inch A1466 (Mid 2012, Mid 2013, Early 2014, Early 2015, 2017) A1369(Late 2010,Mid 2011)【2nd Version Upgrade】 : Electronics
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FIXED- Battery drain issue, Battery service recommended, Battery capacity reduced of Mac OS Big Sur - YouTube
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