Battery drain since security update?

Within a few days of getting my Note 7, I downloaded a security update. Ever since then, my battery -- which was incredible up until that point -- is now draining just as quickly as the two year old phone I just switched from. Any solutions for this?

Update: (MMB29M.N930VVRS1APH1)

Accepted answers

Y79ANG

Did a factory reset. Battery back to normal now.

All comments

Y79ANG

FYI My battery won't even last a whole day now

75H

Me three, read on a search to do a factory reset. Have not attempted same yet.

cynindesign

Check and see what apps are running in the background....also, I've found battery saver apps take more juice...I had 2 security updates, the 18th when I activated my phone and the other day....One thing for sure, there have been MASSIVE updated of my installed apps, but I pretty much keep mine charged while at home and when I go to bed it's 100% and wake up to 99%.....I use live wallpapers which before drained my other Note's batteries....
I supper like the fast charging stand by samsung

cynindesign

Also, if you are like me, I have charging cables and fast chargers plenty, so check on Amazon for micro to USB C adapters and use the ones you have.

Y79ANG

Did a factory reset. Battery back to normal now.