Battery problem - own app

Hi all


I made an app for my own. I observed that if my app is installed the battery life is decreased. The standby and usage time is the same. I tried on 2 phones, one iphone 6 and one iphone 5s. Ios 8. The app is made in swift. It doesn't have any background refresh, message center stuff, turned on. It uses cloudkit for data sync. Is this a normal behaviour? How can, than, make apps for my own, i don't wanna put this on the app store, not at this time. Maybe i will in future.

Battery problem - own app
 
 
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