Reviewers say this energy bank can run for over 24 on a single charge, to keep your devices juiced up in an emergency.

Battery-powered portable fans are an absolute must for many people in the scorching summer heat but if used incorrectly they can add to the risk of heatstroke and even cause harmful accidents.

The Comlife Portable Neck Fan looks like two tiny room fans stuck on the end of a bendable stick. It also has half the battery life and half the power of our other picks. There’s no reason for ...

A computer fan, a switch, and a battery — in ... For example, we use a similar battery to power our portable soldering irons. This is one of those projects where you can easily get carried ...