Don’t get caught with a dead phone; instead
Apple iPhone charger cable, iPhone charger price, iPhone charger adapter
We found this package that looks great at a great price:
Apple smartphones charge at 5 volts, which is the standard for USB devices. The difference between the iPhone and iPad adapters is the amp. i.e. the iPad charger handles 2.1 amps, while the iPhone charger only 1 amp.