Why "Home & Lock Screen" consume more than 20% battery life in iOS 8.3?

Hi, I also got the battery issue after upgrading to the iOS 8.3.
My battery will drop from 100% to 30% within 4 hour battery usage (you can find this is the data in the Settings->General->Battery Usage->Usage)
When I go to check the battery usage of each app, I see "Home & Lock Screen" use 23% battery within 24 hours.
I just dont understand what does "Home & Lock Screen" do basically, and why it consumed so much battery usage?
Anyone has idea or the similar situation?
I'm using iPhone 5s

Hey guys, I believe it can let you extends your battery life significantly by doing the following.
(I did an experiment by myself in these days)
1. Turn off the hands off
2. Turn off the non-necessary background app refresh
3. Turn off the Suggested Apps, both My Apps and App Store
4. Set the location service for every app into "While Using" if you are able to
By doing the settings above, I can extends my battery life 15% and more.
I am using iPhone5s and iOS8.3

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