How do I save battery while recording?
A good rule of thumb for tracking apps is that they typically use 10-15% of your phone's battery per hour.
There are a few things that you can do to help reduce battery drain and further extend your phone's charge:
Turn down your screen's brightness - illuminating your phone's screen uses a lot of power, so in addition to turning down your screen's brightness you should try to minimize the number of times that you look at the screen while recording.
Shut down apps you aren't currently using - certain apps will continue to drain your phone's resources even when they are in the background.
Turn on airplane mode - when your phone doesn't have service, it constantly searches to try to establish a connection which kills your battery. You may have experienced this before if you accidentally left your phone on during a flight. You can help prevent this by switching your phone to airplane mode. In most cases, the GPS capability is still enabled and recording will work just fine. However, for phones running on iOS 8.3 or older, please note that airplane mode will disable your phone's GPS.
If you can't or don't want to use airplane mode, you can extend your battery by turning off your Wifi and/or bluetooth, push notifications, and email sync.