AN515-51 Battery not working properly, any solutions?

Here's the problem: When i start my pc Nitro AN515-5 the battery led light up, signaling it works (It does that if i unplug and plug in the cable too), when loaded into Windows it shows up in the bottom right corner, as it should, signaling it's charging. After a couple of minutes it disappears.
What i did: run dyagnostics and the usual cmd powercfg /batteryreport and powercfg /energy to get the bearing of the situation and in the first minutes the battery actually shows up, working, then it disappears; I tried to reset the battery (shutting off the pc, unplug, bottom reset button, wait 30 min) and the problem still persists; last thing was trying to force drivers update and reinstall them by unistalling the battery itself from Windows.
Scowering the web i found that i could, theoretically, update the Bios and check if that works but here comes the problem, i cannot update the Bios because the battery it's disconnected and i can't update via DOS cause i don't have a USB stick (and i don't want to push my luck in uncharted terrytory for me).

If you need more information about the issue, i can provide more.
Please help me, warranty is still valid on the device and i prefer not to send it away for however long it takes (I use it for work too and don0t have a backup)