21700 Lithium Battery 3.6V 5000mAh with USB Flashlight – High-capacity, durable rechargeable lithium-ion cell designed for portable lighting and tactical flashlights. Features 5A max discharge current, built-in protection against overcharge, over-discharge, short circuit, and low internal resistance ≤80mΩ. Ideal for outdoor, emergency, and industrial applications requiring reliable long-lasting power in compact form.More