Hi guys, I bought a new Mi4 2 weeks ago. It arrived with a fake rom, I installed Xiaomi.eu 188.8.131.52 KK. First days I suffered of huge battery drain without sim inserted, but now, with sim, the main problem is the battery drain after enabling airplane mode. Once the battery start to fall the only way to stop is to restart the phone! It is unbelievable how my 4 years old Galaxy Nexus (with original battery!) is performing better! There is a bug report on official Miui forum, where you can find some tests and testimonials and also confirm this bug if you are suffering: http://en.miui.com/thread-183026-1-1.html. Reading the discussion on Miui forum it seems that with other roms like Cyanogen and Aosp there is no such battery draining. Have you ever faced this problem? I am doing same tests to understand how to reproduce exactly this drain. MAYBE it come out not the first time you enable airplane, but the second one.