Nitecore 21700 Batteries

Nitecore 21700 batteries are protected, ready-to-use lithium-ion cells from one of the most recognizable names in flashlights and portable power.

Unlike bare cells intended for pack assembly, Nitecore's 21700 cells are typically protected, button-top designs — many with built-in USB-C charging — made for direct use in flashlights and high-performance devices. The protection circuit guards against overcharge, over-discharge, and short circuit, making these a convenient, user-friendly choice for everyday carry and high-output gear.

For someone who wants a dependable, high-capacity 21700 that's ready to drop into a device and go, Nitecore is a trusted, widely-recognized option.

Key features

• Protected cells from Nitecore, a trusted consumer brand
• Button-top designs, many with built-in USB-C charging
• 21700 format — high capacity for demanding devices
• Convenient, ready-to-use option for flashlights and gear

Common applications

• High-performance flashlights and EDC lights
• USB-rechargeable everyday devices
• High-drain consumer electronics
• Devices requiring protected, button-top cells