Power Bank, 20000mAh Portable Charger External Battery Pack with 3-Port 5.2A for Phones and Tablets (Black) 20000mAh High Capacity rechargeable capacity guarantees you'll never be without your smartphone or tablet due to a dead battery. High Quality battery cells inside- Top Grade A 18650 battery cells. Ultra-Secure: Security protection designed for short-circuit and over-current protection. Ultra-Safe: Keeps charge with a standby time up to 6 months after fully charged. 500+ recharge cycles over the life of the battery Super-fast Charging Speed: Three USB output ( OutputA 1A, OutputB 2.1A, OutputC 2.1A)