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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...

If you're working in harsh, unpredictable, and hazardous environments, functional and safe equipment is essential. This includes any form of light you use, whether it’s overhead lighting or a portable flashlight. For people regularly exposed to sparks, explosive gasses, and other flammable items on the job, explosion-proof lighting is a necessity. Interested in learning more? Here's the explosion-proof light explained. What Is Explosion-Proof Lighting? An explosion-proof flashlight is designed for use in hazardous locations, where high levels of combustible materials in the air could lead to a fire or explosion. These flashlights can withstand ignition. They trap or contain sparks...