Battery draining quickly while off

[Android Central Question]

So today I went on a car ride somewhere and my battery was at around 70%, and i turned it off to save its battery,, then i turned it back on about 15 minutes later and it was at 5%.

I just wanna know how to fix this,, like lately my battery has been acting weird,, like whenever it reaches around 20% it just dies

I have an s7 and I've had it for about a year and a half,

 

[belodion]

You may need a new battery.

 

[anon(3641385)]

So today I went on a car ride somewhere and my battery was at around 70%, and i turned it off to save its battery,, then i turned it back on about 15 minutes later and it was at 5%.

I just wanna know how to fix this,, like lately my battery has been acting weird,, like whenever it reaches around 20% it just dies

I have an s7 and I've had it for about a year and a half,

Go into settings, device maintenance, battery, battery usage, and see what's eating up your battery.