FAIRTIQ requires access to the GPS during a journey. We measured the battery usage of FAIRTIQ on the various phone models and operating systems. On average we noted that FAIRTIQ uses around 3% per hour.
The battery empties much faster if other apps/features are used alongside FAIRTIQ.
Please note that you are responsible to have battery all along your journey, if your phone is out of battery, you do not own a valid ticket anymore.