mobile

I have a Polaroid 10.1 with decent hardware specs for what I paid, purchased from big lots. It has one fatal flaw and one design flaw. The worst is that all data is wiped to factory anytime it is fully powered off or the battery is fully discharged. Does anyone know what could cause this? I can't return it, I was too lazy for to long and also lost my receipt. I was wondering if perhaps it had a secondary battery like a CMOS that trickles enough power to keep it stored in flash, or if internal SD if I could just replace it? Thank you.