J7 max battery draining issue

[KChauhan]

So i have purchased the device in November. I have constant battery drainage issue on the device. i only get upto 6hours of battery backup.
i am charging it if it's below 15% and removing it after it's 100%.
Tried battery calibration, no-go.
tried with different chargers, no-go
Checked in settings and battery is completely fine.
Coming to usage, i use wifi more often then mobile data to understand issue and tried without wifi or mobile data for a week, no-go. i am not a heavy user, i use device for calls/messages/social networks/writing and very rarely games.
If you have any suggestions or advice then i am all ears.
Also wanted to tell that device restarts on it's own sometimes.

[PrasadRana]

right bro this also going on my j7max mobile phone

[PrasadRana]

this is big issueee.

[KChauhan]

Samsung should roll out an update for this issues.

[AdhyanRajawat]

no i hve also j7 max its working nice its battery too as i play PubG working nice but there is issue only about that fucking oreo update didnt get till now

[KChauhan]

how much battery backup you're getting on the device on medium and heavy usage?

[AdhyanRajawat]

heavy usage i getting around 5hours hours n normal usage i get between 8 to 9 hours

[KChauhan]

That's good but for my device i am not getting enough battery backup.

[AdhyanRajawat]

dnt knw whats hppn to ur device. did you get any security patch update. because its drain 10 t0 12 percentage in a hour at normal usage. i bought my device in aug 2017 its been 1 year still working good

[KChauhan]

Security updates are updated and even device is also up-to-date.