What is a high capacity power bank?

A high capacity power bank is a portable device used to store and deliver electrical energy to recharge electronic devices like smartphones, tablets, and laptops on the go.

How much power should a power bank have?

Power banks are always a trade-off between weight and capacity. For a quick top-up during a day out you want something small and portable, but don’t go much lower than 5,000 mAh, which will put about an 80% charge into most smartphones (about 800mAh of the battery’s energy is actually used to transfer power to a device).

How to choose a power bank?

: The capacity of a power bank is measured in milliampere-hours (mAh). Consider your typical device usage and choose a power bank with sufficient capacity to provide multiple charges. For smartphones, a power bank with a capacity of 10,000mAh to 20,000mAh is generally suitable. : Determine how many devices you plan to charge simultaneously.

What is a medium power bank?

Medium power banks represent a nice balance between portability and capacity. They're about the same weight as a paperback book, can fit into a large pocket, and have enough capacity to charge a smartphone twice. Only logged-in Which? members can view the power bank test results below.

How much does a power bank cost?

For this range of power banks, you can pay anywhere from $20 to $160. Power banks with a capacity rating of 20,000 mAh or larger are the most versatile of the group. They offer the greatest array of inputs and outputs as they are designed to charge multiple devices at once or charge a single device multiple times.

How much does a power bank weigh?

At 2.1 pounds and 8.5 inches long, it takes some liberties with its self-described “portable” nature. Still, this power bank justifies its size with a massive 27,000 mAh capacity and a handy AC power outlet. We tested all the power banks on this list thoroughly in daily life, outdoors adventuring, and even some travel.