I just charged my phone, why did restart and jump down to 37%?

[imtheqt18]

Last night I updates my phone to the Marshmallow update for my Note 4 and so this morning my phone was at a battery life at 100%, it then shut down and then turned back on to a battery life of 37%. What i did then was restart my phone and took out the battery it went back up to 60%. What happened?

 

[natehoy]

Generally when doing an operating system upgrade, I've had much better luck doing a factory reset.

Clearing the cache can sometimes help with odd stuff after an upgrade (power down, press and hold (POWER - HOME - VOLUME-UP), release when the phone shows "recovery starting", press VOUME-UP when you see the Android with the spinning thing in his belly, select [CLEAR CACHE] a couple of times, and then select RESTART)

Barring either of those, simply using the phone should allow the new OS and the battery to "get to know" each other, and it should clear up in a few battery cycles.

 

[Rukbat]

Go to Settings/Battery and take a screenshot. Tap the graph and take another screenshot. Post them (see How To Post Screenshots on Android Central). I'm suspecting the battery at this point.