Help my ThinkPad won't discharge below 6% for over an hour now

I am afraid of what is coming. I see it.

It's the T520. It has a Lenovo branded 9-cell, Vantage says made in 2016. I highly doubt it. I've recently decided to do a battery cycling to have more accurate results. This is where things went weird..

I've used it to 7% today from 78%, hauled it back to the dorms and plugged it in. Started the cycle. It climbed the first few percent really slowly, then from around forty it went like the usual charging. Discharging on the other hand..

I've set it to 100% brightness, turned on wifi and left it open with the Vantage app (that piece of garbage shit eats cpu like it's cheesecake). It's stuck on 6% for over an hour now. I was afraid this would happen, just like last time.. with the T410 my old roommate had.

It woke up in the middle of the night. Thing is, it was shut down, not set to sleep. All 6 of us in the dorms had nightmares, sometimes we heard optical disc sounds, sometimes the BIOS beeps.. One time my friend was using the T410 and I was clipping my toenails so I faced the litter bin, my back facing the ThinkPad. I was hit hard. I turned around shouting "Fuck you".. he asked what's wrong, he did nothing. I was shocked. I am sure it's the same thing again. I will not sleep again.

I'm writing this for some time now but it's still at 6%. No amount of JS in Firefox drains it further. The local church won't pick up the damn phone, and my roommate is away, I am alone. Please, for the love of God, help me