sudden decrease of battery capacity

[Simon Jing]

over night battery report shows that battery has lost alot, from 49000mWh to now 28000mWh, design capacity 58000, about two hundred charge cycles, im not sure if a 21000mWh drop overnight is normal but im not sure. what could have caused this and or how could i prevent this from happening in the future, what do i do now.

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