The biggest problem of tablets that are being used more than computers today is the battery problem. Running out of batteries immediately limits the usage area. But there are ways to improve the time of use.
It is best to run out of battery completely to perform battery calibration on tablets. However, you should know what to do after you have finished. It is not an event to finish the battery and put it in charge. Do not open the tablet after running out of battery. It won't open anyway. However, when you plug it in, do not open it. When it is completely empty, plug it off and charge it until evening. In this way, your battery will be calibrated.
I want to end the position by telling you about a problem I have encountered myself. The tablet charges up to 100%. I use. But when it reaches 50%, it suddenly shuts down. It doesn't even signal. I can read the text Closing. I am also sure that my charge is half full. Such a problem can only be caused by the battery. I thought and did battery calibration as a solution. I removed it after calibrating and the charge suddenly halved. Exactly 50%. I charged it once more. It is normal now and no longer closes when it reaches 50%.
Your problem is solved with a high probability. But technology is luck. There is a small chance that this solution may not work.