Even I was one of xiaomi fan who had an MI3 and powerbank from MI. Inspired by these products I purchased this Mi4i on the blast sale on 28th July 2015, it took 6 days to deliver the product. On 3rd August I received the handset and was curious to enjoy this piece. But my expectations was in vain, as soon as I switched on the phone, severe heating and batter was at 3% which I thought its common in a new smart phone. So I switched off the phone and put for charge for 4 hours and later switched it On, BATTERY HEATING ISSUE was still there and the BATTERY DRAINING was like flowing water within 1hour the battery was at 10%.
I contacted the call center for this issue they said me to do some tests and finally said " ITS A BATTERY ISSUE AND ITS COMMON IN ALL Mi4i".