Battery usege of home& lock screen

Hello,

I've been using IP8 for 2 weeks. Battery usage is around %20 for home& lock screen from yesyerday. Battery was around %87 before sleep and woke and up it's %47. I checked the device and everything seems good. Apple support also checked my phone and could not find any hardware problem but still battery using too mush and fast.

Is there any solution that you can advise?