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Officially?

You can't do it officially, but Coconut battery has been around for a while and I think it's quite trustworthy. I think it uses the sensors and diagnostic data of the device itself to give you information - meaning, it's what Apple sees when they use diagnotstic tools. I could be wrong.
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What is yr battery health?
Mine 80 cycles 95.4% battery health.

96.4 after 152 cycles. I mostly charge via my Mac.
 
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110 cycles 93%... is this normal? Fluctuates betweem 91.8-93%. Should I exchange it?
 
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