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I just upgrade my iPhone 6 to iOS 10.2. It’s OK for the first 2 weeks then it shutdown when i using web browser and said that the battery is drained. After I charged, the battery status remain at 100%, even that i tried doing benchmark constantly. How can I fix it? Thanks

How to Restore Apple Devices Without itunes using 3UTools https://www.youtube.com/watch?v=VfVb2mxs

Is it stuck at 100%? You may have a bad battery. You can use a program called 3Utools to check battery reading information.