Why does the battery of Motorola Moto G4 Plus go from 100% to 50% in 20-25 minutes?

I buy moto g4 plus in Oct 2016 but my battery backup is not good , it become 100 % to 50% in 20 to 25 minute so I want to know what to do.

Happened to me on my older phones. What I did was I drain the battery and fully charge it off, battery improved after that. Please try that too.

Not the answer you were looking for?