Battery Problem with E5-576G, even at 100% battery goes down to 0% and shuts off, Please help

So I have a E5 576G laptop that is very old, I know for a fact that the battery is done for and even though this laptop is not meant for gaming I use it for gaming, I always keep it plugged in so it's always at 100% but sometimes the electricity in my house goes off and the battery goes down to 0% and shuts off, usually when it comes back on it starts charging and goes back to 100% in a few hours but now its stuck at 1% and I've been charging it all night (approx 15 hours) I don'

t know if it's a fault with a driver but this has never happened before, this problem is not allowing me to play games as it lags so much its unusable, Please help me if you can.

[Edited the thread to add issue detail]