Same problem here. First time use 100% to 15% in 6 hours. An hour later 4% and then 15 hours with 1%. After recharge I checked the battery with some app and guess what: the battery is 1000mAh and at 100% it only have 3.8V. After half day I managed to upgrade the firmware but again the battery showed...

Same problem here. 100% to 15% in 6-7 hours. After this, almost 15 hours with 1%. After charging the battery, to 100%, the voltage was only 3.8V and again 5-7 hours until 15% but after hitting the 1% mark the phone shut down. Additional, the proximity sensor is horrible and the calibration doesn't d...