I bought a new battery to see whether the issue lay with my original battery, and it worked fine for a while before it also succumbed to the issue. Now the new battery no longer charges even after repeating the above process. My original battery seems to charge temporarily after I repeat the above process. Notepad++
I have further noticed that my AC light flashes continuously while plugged in, whether the laptop is on or off, which it never used to do. Malwarebytes
Also, note that the battery never charges, now matter how low the available remaining power gets - my problem doesn't appear (to me) to be a feature designed to prolong battery life. FileZilla
I would really like to fix this problem permanently but am completely stumped. Cheers!