Hi, I have a problem with my MI-2S. System is always in power saving mode, bluetooth, gps, location services are off, network type is set to 2G, the only thing that is turned on is WiFi. With this kind of use the battery lasts about 12hours, and never more than that. I tried at least 10 different versions of MIUI developers rom (some of them with data reset and wipe), and latest stable rom, and battery life doesn't change. I even tried taking SIM card out and putting the phone in airplane mode over night, and in the morning (that was about 8 hours of battery life) the battery was down do 56% from fully charged 100%. In the attachment is is one example of the typical use of this phone. I can post other shots once I get home... I tried app that if integrated into MIUI, Betterbatterystats, CPU Usage & Process List Viewer and Snapdragon BatteryGuru apps to try to find out what drains the battery, but there is no clear sign to what drains the battery, it seems it is not a process. Also lower half of the phone (I guess this is where chipset is located) i most of the time warm to the touch, even when the phone is not used and is in my pocket. Also, the retailer that sold me the phone, sent me another original battery, and with that one also the battery life doesn't change. I also need to mention that about first month-month and a half the battery life is great, and battery lasted about 3 - 3,5 days with a single charge.