Hi @acca_larentia ,
If the tablet stays on when connected to the charger but not when working on the battery only it appears that the battery is failing and is unable to handle the load.
Try replacing the battery and see if that resolves the problem.
Here are some links that may be of some help.
This one shows how to open the tablet so that the battery can be accessed.
Nextbook Ares 8" Tablet Teardown
This link to a video may also help as it is for your model, (although not the same problem as your tablet) and the battery is shown in the first couple of minutes.
Replacement batteries are available online although all that I found were “used” and not new. You may have better luck. Just search for Nextbook NX16A8116K battery to get results for suppliers.
Here’s a link to just one supplier. It is only shown to give you an idea of the cost of the battery.
Hopefully this is of some help
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