My father got a brand new Google Nexus 7 II (2013) LTE tablet few weeks ago. Ever since first use, he was complying about battery discharge rate. Few days ago, I did some measures and I'm quite shocked:
When battery was charged up to approximately 60-70% at 10 pm and tablet was turned completely off, battery turned out to be completely exhausted (0% charge) at 6 am next day. So, it lost 60% / 8h.
When battery was charged up to 100% at 10 pm on Thursday (!) and tablet was left on, but not used at all (screen dimmed, airplane mode, tablet lying on shelf), battery turned out to have 90% charge level on Sunday morning (!). So, it lost 10% / 60h (2,5 days) (!!!).
How it is possible, that mobile device, equipped with nearly newest Android, has so enormous differences in battery drainage, when it is turned on, but unused, versus it is turned off completely? This is something completely unbelievable (I wouldn't believed if, if I hadn't seen this for my own eyes)! We have battery discharge of 7,5% per hour in first case versus 0.16% per hour in second case. That is 45 times slower!
Is this normal (I haven't observed something like that on any other of my mobile devices, including two years older Google Nexus phone) or does it suggests battery / tablet malfuction?