My tablet will not stay charged long after fully charging 15 min.

It could be a number of things. Try using another charger to see if it is the charger that is not working. If it works, then it’s the charger that needs replacing. If it doesn’t work, then it could be the battery.

well it could be a bad battery but i don’t think so if you have been doing a lot of short charges the battery has a memory and only remembers the short charges so you need to run it so it wont even turn on anymore and if you can get the back off you will see the battery it is flat and about 5-6 inches long find a paper clip or a piece of wire with bare ends on it and where you see a red and black wire together short them out do this 2 -3 times then put your back on and charge it for 12 hours and that should fix it this is called retraining your battery if this works from now on no short charges at least 6 hours at a time if you see any bubbling on the battery that means the battery is bad good luck tech.