If you’re on the go without access to a power source, keeping your phone juiced up can be a challenge. Fortunately, the best portable chargers for iPhones take up minimal space, and some offer up to five full charges to your device, so you can continue to text, browse the web, and make calls, no matter where the day takes you. Among the features you’ll want to consider in an external battery pack are its capacity, how quickly it recharges, and its overall size and weight.
