Originally Posted by
kingston
I know you CAN look at your phone while you are riding, but practically speaking, it's not a feasible option unless you have a generator hub and a power port. Either that or go for very short rides.
I have a Delta phone mount on my bike, which holds it in an easily-viewable position above the stem. I've used it a bit with the display on, but not enough to know how long it would last. This morning, I started with about 97%, actively recorded for 2.5 hours and when I got home ~4 hours later it was between 70 and 80%. But of course, the display was off for much of that time, so who knows.