5,000 mAh high-capacity Type-C direct-charge 21700 Li-ion battery is of high-energy-density equal to a small power bank for longer endurance. Equipped with one Type-C charging cable, it is able to connect to the computer, power adapter, in-car charger, power bank, and other devices for quick recharging. Multiple circuit protection ensures better security assurance. It is economical and environmentally-friendly with cyclical charging over 300 times, to reduce the frequency and cost of changing batteries.