background ibeacon scan battery drain? (iOS)

[d0uub]

Version

1.1

Steps to reproduce

1. componentWillMount register several ibeacon
2. local notification in Beacons.BeaconsEventEmitter.addListener "regionDidExit" and "regionDidEnter"
3. run as background

when i put the iphone over night, it drain more than 50% of battery of my iphone, how can i stop / start by specific time? if i implement componentWillUnmount will it keep run as background?