This is the product's overall performance score, based on key tests conducted by our industry experts in the CHOICE labs.

Amazon has discounted Anker’s 20,000mAh Prime Power Bank — with optional base included — to $110 or 41 percent off its regular $185 price. As mentioned, the last time the Anker Prime was $ ...

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.

Is your phone, tablet, or laptop typically in the battery red zone before the day's end? These portable chargers and power banks give you the most boost when you're out of juice.