Power consumption depends on iBeacon configuration parameters of advertising interval and transmit power. Battery life can range between 1–24 months.
Battery consumption of the phones is a factor that must be taken into account when deploying beacon enabled apps.
A recent report has shown that older phones tend to draw more battery in the vicinity of iBeacons, while the newer phones can be more efficient in the same environment.In addition to the time spent by the phone scanning, number of scans and number of beacons in the vicinity