The first Nextbook 8 model NX785QC8G tablet I bought, was from Walmart sometime mid summer 2014 AND it was running Jelly Bean. Battery lasted maybe 5 1/2 months; didn't realize tablet had 1 year warranty if I registered tablet with copy of receipt and have it fixed.

So, bought another Nextbook NX785QC8Gu several months later; this one came out running KitKat. I registered online and copied my receipt, which was uploaded to them. Still have had several problems with battery...ie.turning off before completely discharged, not charging in a reliable steady manner,and more. The Li-ion battery(what I thought it was), being 4,000 mAh, should be more than enough to last quite a long time....No web surfing, d.loading or game playing...just YouTube video watching. Can this battery be changed out? The first nextbook the battery quit in, I took it apart - the battery was glued & the speaker wires were attached just as you described.