I confused to buy a7 bacause of these reviews like heating problem&hanging. But I bought a7 yesterdays. It is so so ok. No heating problem either during charging or using internet too long. Battery life is just above average, it is ok for me.If you wanna buy it, go and buy it. But no signal light for charging.
So am using this smartphone past 3 months and I had a good experience. no battery problem.