I'm using Lenovo A5000 and my battery has no problem going from 100% to 40% during morning even when I'm not using my phone at all. It's on standby with both WiFi and Bluetooth off, I also clear my cache and close all the apps after I use them. Even when I charge my phone to 100% and then go to sleep, when I wake up 6 hours later, it's on 80%. The battery drives me nuts. No matter how little I use the apps or wifi. I handle the brightness manually and I don't have a hotspot or anything running. At least I think so. What can I do? I missed my important alarm this morning because my phone died within 6 hours even when it was at 26% when I went to bed.