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A reversed polarity can be dangerous to your devices. You can prevent it with reverse polarity protection—but what is reverse polarity protection, exactly?

Whether you're caving, climbing, or assisting on a search and rescue mission, ascenders are important to have. Here's how to properly use climbing ascenders.

Batteries aren't all the same. One battery might fit one device, but not another, and some batteries are longer-lasting, more powerful, or more reusable than others. 21700 batteries—which are considered a substantial upgrade from the usual 18650 battery—come with unique features and, more importantly, pack a punch. Interested in learning more about 21700 batteries? Here's our 21700-battery guide: what you need to know. What Is a 21700 Battery? 21700 batteries are rechargeable, lithium-ion cells. They're used to power flashlights, cars, electric bikes, and other heavy-duty devices. The 21700 battery is named after its dimensions: 21mm in diameter and 70mm in...