Why is my Note 4 is battery draining so fast?

[jeev9]

My Note 4 is almost a year old. The battery starts to drain

Fully charged. Phone left with nothing done. But battery drains within an hour or so by 20%

 

[codeda]

Re: My Note 4 is almost a year old. The battery starts to drain

Do you mean a different phone? Surely your note 4 isn't almost a year old