21700 Battery Cells & Chargers

Team Orbtronic is passionate about 21700 batteries. These lithium-ion cells measure 21mm wide and 70mm long [Unprotected Flat Top bare cell] or 21mm x 75mm [Protected Button Top battery], delivering more power—between 4000mAh and 6000mAh—than smaller 18650s.The larger form factor allows manufacturers to pack more active materials inside, resulting in higher capacity and better power output in the same relative space. Our lineup features reliable options like the unprotected 5000mAh and our protected 6000mAh batteries, designed for your toughest tasks.

For many applications, yes! Our 21700 batteries provide 35-50% more capacity and superior heat management compared to 18650s, making them excellent for power tools and high performance flashlights.They’re slightly larger, so 18650s may suit smaller devices. Explore our store to find the right fit!

A 6000mAh 21700 battery from Orbtronic can power a flashlight for 10-20 hours on low or 1-2 hours on high—outlasting most 18650s. With proper care, they’ll last 300-500 charge cycles, or 3-5 years. Use our Xtar VC2SL charger for proper CC/CV charging and the safety case [included] with every pair [always keep cells that are not in use inside this plastic box].

In the consumer electronics space, high-powered flashlights and portable lighting systems have embraced 21700 cells for their extended runtime and improved brightness capabilities.Our customers rely on 21700 batteries for flashlights that shine longer, tools that work harder, and DIY projects like portable power packs. Whether you’re illuminating a worksite or building something custom, Orbtronic has the perfect 21700 for you—see below!

Charging is simple with our equipment. The Xtar VP4L Plus or VC2SL chargers support all our 21700 batteries, reaching 4.2V max. A 5000mAh battery takes 3-5 hours at 1A, or less at 2A. Use our chargers and avoid overcharging for safe, consistent power, and better lifespan.

Choosing a 21700 battery from Orbtronic is straightforward—just match it to your device. Higher mAh means longer runtime; higher amps (like 13A+) suits heavy-duty tools. Our protected batteries add safety, while unprotected ones are for experts and battery pack builders. Finally, ensure any battery you purchase includes appropriate protection circuits to prevent over-charging, over-discharging, and short-circuit conditions.We offer high-drain Molicel, and our own designs—quality you can trust.

Yes, they are safe when used properly! Our unprotected flat top 21700 batteries include pressure relief mechanisms, thermal fuses, and specialized separators that prevent internal short circuits. Use high-quality Li-ion chargers, keep them internally undamaged, and avoid carrying loose cells with metal objects. Orbtronic Protected Button Top 21700 cells, which include built-in circuit boards [Advanced Safety Protection] to prevent over-charging, over-discharging, and short circuits, offer additional safety for less experienced users, and for all folks who value extra safety & reliability.

After working in the battery industry for over 16 years, we have fine-tuned our range of 21700 battery cells, which include brands such as Panasonic-Sanyo, Samsung, Molicel, and our own protected and unprotected flat top designs—alongside chargers like the Xtar VC4SL. Need 100+ units? We’ve got you covered. Enjoy fast shipping from Florida, free battery holder [cases] with every pair, and support from our experts—we’re ready to power your projects! Shop now at our category page.