Originally Posted by
johnny99
How much battery does it use with voice turn-by-turn navigation? I tried using the Cue Sheet app, but its turn-by-turn navigation really burns battery. Will give your app a try if it can navigate a 5 hour century ride without completely draining my battery. Not really concerned with data recording since there are already plenty of apps that do that well.
Johnny, I listen to audio-books via Bluetooth on some of my long rides. I carry a high-capacity external battery which extends phone "life" by 3X or so. These units are inexpensive and probably only weigh 1/3 of the phone, itself. It's a good backup to have even if you don't keep it connected in the event you run your phone down.