Lishen 21700 Li-ion Batteries are high-performance rechargeable cylindrical cells designed to deliver stable power with excellent cycle life. Available in 4000mAh and 5000mAh capacities, these batteries are widely used in e-bikes, power tools, solar storage, UPS, flashlights, and DIY battery packs. With a nominal voltage of 3.7V, they ensure efficient energy output and reliable performance in demanding applications.