Something's happening to my battery

[Suspend]

Hi, four hours ago I disconnected my 820 from the charger and left it on airplane mode. I haven't used it, but its battery is at 50% now, four hours later. Everything is turned off, I don't know what the problem could be. If anyone has any idea, please respond

 

[WanderingTraveler]

Was it fully charged when you disconnected it?

If so, try to reboot and look into your background tasks.

 

[Suspend]

Of course it was full and i got only 1 running background task for bing weather app, just did a hard reset yesterday