Why won't my tablet charge when powered off?

I have found a solution so stupid it’s almost hilarious.

Step 1) Sit near the power adapter and plug the tablet in, make sure you start a Youtube video to maintain sanity.

Step 2) Every time the tablet screen turns on, count to 5 in your head and plug it out, wait until screen darkens.

Step 3) Repeat step 2 for about 15-20 minutes to build up enough charge to get into the custom OS loader thingy.

Step 4) Enter custom OS loader thingy by pressing and holding power and down until a blueish green screen pops up, and press volume down to restart quick as this screen flashes too regardless if the charger is plugged in or not.

Step 5) The very moment it boots up and asks for the pin (or if you don’t have a pin just the very moment it turns on), press the power button, and let it sit for about 4-5 hours. By this time it should gain enough charge for use, and make sure you never let the battery drop to 0%, no matter the cost.

This worked for me, maybe if someone else faces this issue and just needs a “quick” solution without removing the “non-removable battery” and replacing it with a better one, or changing a motherboard which I am the most suspicious about causing this issue. It charges perfectly now, just never. let. it. drop. to. 0%.