As you can see by the pictures the battery is fairly degraded almost 30% less than normal also Is this battery aftermarket? I hope this can help
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=== Update (10/30/2018) ===
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OK, thanks thats what I needed to know did it start doing this after an update because this could be a software issue with mac OS and just an FYI apple will always say there is water damage because the sensors are set off even by a little bit of mist but you could try backing it up and resetting it