LG G3 Battery Life Drain topic

so i have my G3 for a week its the 32gb variant .
i just noticed today that the battery life suddenly dropped.
i always charge my phone when it reaches 2% and i don't know but it charges fast using the original charger
from 100% after like 5 mins it dropped to 96% and it drained even faster
look time to factory restored it but no avail it still shows the problem
have my screen brightness
@auto shows +2h battery use
@0% +2h battery use
@100% +2h battery use

Screen use at 50%

if someone can help me please do. thanks

if having and sd can drain battery life i've also tried removing / formatting the card. no luck
its a sandisk 32gb. please help me thank you

im also running @Stock rom android 5.0 loli all stock i've done nothing on my g3