2012 MBP Retina 15" Battery Replacement

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The system shows the battery is having a problem

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went well. Remember to drain your battery first just for better safety.

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you can follow the advice from here: https://www.youtube.com/watch?v=ruG2Nh-r..., i.e. use a string to "cut out" the battery from the container.

It worked pretty well and so you don't have to take everything apart because you don't need to use the adhesive liquid remover a lot.