have you got a spare battery to try , I used to use rechargeable batteries when I flew radio controlled planes , batteries are made up of cells and if you constantly charge rechargeable batteries when they don't need it they suffer from cell blindness , this means you think it is fully charged but because it is going blind only half of it may be getting charged. In my case it could me a sudden loss of power and a possible plane crash , in your case , a sudden loss of power could mean a pc crash or not starting properly.
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