My Samsung S7 quickly discharged

Alex
What is the model of your s7?
And what software version is it currently running on?
You can find this in settings under About Phone.
Did you recieved any software updates
Just before the problem started?
If yes, can You tell me the name of this update?
Are you having any other problems with your phone?

I own a galaxy s7 also.
I think I know why your having this problem but I need this information before I can answer you.

— modified on Dec 18, 2018, 11:41:53 AM

Alex
People all over the internet are screaming about the 9.0 update in the S7's.
They are saying that update is causing rapid battery drain and excessive ads popping up.
The popular reason seems to be that it's caused by a third party app interfering with the 9.0 software
The recommendation is to uninstall your third party apps one at a time to discover which app is causing the problems.
If that don't work let me know.
I have a different theory!

— modified on Dec 18, 2018, 11:26:38 PM

Hello Alex,
Which charger you are using in your Samsung Galaxy S7?

Alex

Qualcomm 3.0
actually I found it on Aliexpress

Alex
If that is not the charger that came with your phone, that might be the problem!
Try using the original charger and see if you still have the problem!
You should always stick with the charger that came with your phone.
It was designed for the battery in your phone . That other charger was not!

— modified on Dec 21, 2018, 1:31:15 PM