Here is a tip on how to keep your phone charged while recording rides.
Use Velcro to secure a USB phone charger to your top tube or anywhere on your bicycle. I have seen one secured under the top tube on a road bike, on top of the top tube and even on the handlebar stem.
Here are a few images of the charger attached to the top tube and the extra cord secured with an additional piece on the side. Be sure to put the soft side of the Velcro on the USB charger, so if you want to put it in your pocket or in a bag it wont get stuck to anything. Stick the rough side on the bike.