USB Car Charger
If you have a newer car, it likely has USB ports already built in, but if you have an older vehicle (and even some newer vehicles), USB doesn't come standard.
This is why a USB car charger is a great gift for pretty much anyone, as it allows users to charge up their phones in the car while driving, and if you use maps and navigation a lot, a USB car charger is pretty much required to keep your battery from draining.
There are a ton of options to choose from, but you don't need to go too fancy. Amazon even has its own that's around $7 that can get the job done.