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replacement battery from ifixit draining quickly and charging slowly!

Hi all. I bought a replacement battery for my 2011 macbook pro from iFixit, and have found it to be very slow charging, and just now when operating on battery power it jumped from 80% charged down to 25% in a few seconds, and steadily drained down to 7% from there before I plugged it in.


Could I have missed a step in the battery replacement process?


Or could this be aside effect of buying an early 2011 battery for a late 2011 macbook, or vice versa? I bought the computer second hand so not entirely sure which one mine is.

Answer this question I have this problem too

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This question was migrated from https://www.ifixit.com/Answers.

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Hi Ben!

Performing a battery calibration may fix this: ++https://help.ifixit.com/article/265-batt...

If this does not fix the slow charge, we recommend contacting our customer support team at support@ifixit.com so we can assist with further troubleshooting. The MacBook’s model number should match the model number in the Compatibility Section of the product page for the battery.

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bencoopermusician92 will be eternally grateful.
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