I have the same issue with 2 of iFixits replacement batteries for this model.[br]
Boths are not recognized after 6 and 9 months of use. [br]
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The logic board is NOT the problem. It worked fine with the original (8 year old) battery and can still detect it.[br]
But both the iFixit batteries are not recognized at all. [br]
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Either, iFixit needs to investigate this further or they need to stop selling this battery. There is no point swapping perfectly good cells every couple of months, because the BMS controller dies. [br]
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I am willing to send my defective batteries in for investigation. What is the best way to contact iFixit in a case like this?