You’d probably be better off buying your own portable charger. Really, the only advantage to the FuelRod is that you never have to charge it.
How it works: you buy it once, the machine gives you a fully charged rod that has enough juice to charge your phone once, and from there you can drop the depleted rod intro the machine and it’ll give you a new fully charged one. You can do this over and over forever, it doesn’t stop at the end of the day.
It’s easy. It works.
But I’d avoid it for two reasons: (1) the company recently started charging money for swaps, there was a huge backlash and they went back to free swaps, but who knows how long that will last, and (2) there are better portable chargers available if you intend to buy one for long term use.