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Placed new battery, but when charging it to 100%

After its gets charged, and I remove the cable, it drops down from 100% to around 5-7% very fast, why doesn’t it stay with high battery number for a longer time?

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2 Comments:

lets get some diagnostics here. Install this gem of an app: CoconutBattery. Take a scene snapshot of the main window one with the MagSafe connected and one with just the battery. Post both of them here for us to see Adding images to an existing question

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You can check your battery health by using coconut battery as suggested by @Dan and i suggest you to do smc and pvram reset for you mac and check again using coconut battery if you have already done that follow old post suggested by Dan

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