i recently got a new chinese gaming tablet, the specs are
RK3028 chipset (cpu: 1GHz dual core + mali 400 GPU)
512 RAM DDR3
2500 mAh lithium battery
it works great but the battery lasts for no more than 3 hours
when i connect the device via usb it has the charging icon but the battery doesnt charge in fact, the battery goes down slowly if i use the device while charging
when i check the running apps theres only the system UI and the android keyboard running yet still is using 400 MB RAM, nothing intereresting on the process either, not even my phone with all the phone functions and the social apps uses that much
something must be draining the battery really bad, there is a way to check what is it?