The Anker PowerCore Essential 20000 is a power bank designed for charging smartphones and other smaller devices multiple ...

The Anker PowerCore Essential 20000 is a basic power bank with a reasonable capacity for multiple charges, but the 15W power output means that larger devices such as laptops are out of the question.

We're at the stage now where a 10,000mAh battery is common in a power bank, and 20,000 or more is not unheard of. That's enough to charge a smartphone three times over, so if you're on a weekend ...