When selecting a portable battery, you’ll need to determine when, where and how you might use it. For example, what type of device do you need to charge, and how many different devices will you charge at one time? Also, how long will you be away from a wall charger in between uses? This is important, as one of the key parts of a portable battery is the battery’s charging capacity.
A good starting place is to get a battery that can fully charge your device one time. For example, an iPhone X has a 2,716 mAh battery, which means that you’ll need at least a 3,000 mAh battery to charge it one time. If you need to charge it several times in one trip, or perhaps charge additional devices, you’ll want a battery with at least 16,000 mAh. If you’re not sure what size battery to buy, always opt for a larger capacity.
There is more to buying a battery than charging time, as many people also consider the battery size. Battery size matters if you plan to carry the device in a pocket, purse, backpack or glove box. Additionally, portable batteries have features like multiple USB ports for charging more than one device at a time, an integrated LED flashlight, Bluetooth to monitor battery charges, rugged construction for outdoor usage and even solar charging capabilities.