Today strange thing happened to my iPhone 6 when its battery was down to 8% I charged it using original Usb cable via laptop usb port when it reached to 20 % I took it off and started a route through Google maps app it went well till 15% then it skipped battery %age directly to 11% and when I closed every app including maps its battery was at 6% and phone was in screen off state after 10 mins I waked my phone up and battery was all the way to 1% but it stayed at 1% like 1 hour. Any one can guess what it is? Is it battery calibration problem or what . I bought my phone 5 days ago and it's new.