External battery mobile power

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Most people can find use for a USB power bank (also called an external battery pack, backup battery, or portable charger) to keep phones and other devices charged while on the go. Rather than tracking down a wall outlet, owning a USB power bank allows you to enjoy a conveniently portable (albeit limited) power supply.

Watching your phone or tablet steadily run out of power when you're nowhere near an outlet is stressful. But there's an easy solution: a portable battery or power bank. These are available in many sizes and capacities, and can include lots of handy features like fast charging and multiple ports.

Qi is the dominant standard for compatible Android phones (up to 15W), while Apple iPhones rely on MagSafe charging (up to 25W). iPhones will also charge wirelessly on Qi chargers (7.5W) and Qi2 chargers (15W). Some battery makers have built Qi or MagSafe-compatible wireless charging into the surfaces of their portable batteries.

For Qi-compatible devices, we also have a separate guide to the best wireless portable chargers and power banks. The best replacement for your original charger is the Nekteck 60W USB-C GaN Charger. It's cheaper and smaller but just as powerful and reliable.

A 20,000mAh battery can charge two phones twice, or a phone twice and a tablet once. Some power banks have enough juice to power laptops. Of course, a higher capacity often translates to a heavier, larger, and more expensive battery. In the end, it's best to assess your typical needs before buying.