Hello, I bought a few days ago my xiaomi redmi note 2. Since then I have a problem with the battery, as it lasts very little. I tried several apps to save battery, always close applications in the background, and nothing works. If I leave the cell only with WiFi and the screen turned off in about 5 hours already spent 50% I went to the battery settings and I get the android system uses 40% of it, so I think it may be related to this. Please if anyone knows what the problem is, or how I can fix it I would appreciate help. Both the phone and the battery (3060mAh) are new. Thanks.