There are serious advantages in two "cycling" specific things to own. One, a good set of lights. Spend some money, get a good light. There are some really good knock off brands out there that deliver great amounts of light on the cheap too.
Two, if you track miles, a cycling specific computer rather than a smart phone....but that is a whole other subject.

The way I like having gadgets going while I ride, I have been giving serious thought to looking into a generator hub or the like. With the new city/tour bike I got I actually carry more goodies with me now than my other bike weights, complete. I had been using a solar charger to top things off when and if needed while out riding but it died.