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ZH960 TABLET

Curious what causes this
also can you charge a tablet through a USB port on a laptop

Yes a laptop USB port can be used to charge your tablet but that's a conditional matter. A USB 2.x port cannot supply enough current (limited to 500mAh). Your model:
https://www.lightinthebox.com/en/p/...-quad-core-1gb-16gb_p7357777.html?prm=1.3.6.0
apparently has a 4000mAh battery so that's for the most part just a trickle charge. It's going to take several hours to recharge the battery depending on how depleted it is. That could account for this 12% matter, if you are using a USB 2.x port.

So be sure to use a USB 3.x port which can supply quite a bit more. (USB 3.x ports should be distinguished by their blue inserts). But you'll better off using whatever charger/adapter that came with your tablet.
If you have been using the cable and the charger that came with your tablet, than there's a good chance the battery itself is bad or failing. Like @MrJavi suggested, it's new so that will much it much easier to just get a new replacement.
 
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