I recently replaced the battery on my MBP mid 2012 and it was working fine. I did the calibration and it seemed the battery was doing great. I was using my laptop until it hit 10% and the laptop suddenly shut down. I have tried to turn it back on using the power button but it is unresponsive. I have performed an SMC reset but it still will not turn on. How would I know if the battery is defective?
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