The USB-C Rechargeable 21700-4800 mAh Li-ion Battery charges quicker and easier than traditional batteries and can be charged from virtually any USB power source - wall charger, computer, car charger, or power bank. It features multiple circuit protection chips for enhanced safety assurance, and a LED charging indicator for easy reference. Economical and environmentally friendly, it reduces waste and provides a dependable power source for your flashlights.