AZ16-1 EforTek Replacement Battery(2 Packs) and Dual USB Charger for Xiaomi YI 4K,Yi 4K+,Yi Lite,YI 360 VR Action Camera100% Compatible with Original Two Batteries for Long Video TimeCarry a fully charged AZ16-1/AZ16-2 battery wherever you go so you're never miss the moment ; only 2.5 hours to simultaneously recharge both batteries from the Micro-USB 5V / 2.1A input More Power for More Video: Each 1400mAh battery offers you long action video Save your charging time: Charges 2 AZ16-1 camera batteries at the same time,Smart LED light indicated RED when charging and GREEN when complete 3 Ways to Charge: Unlike standard chargers with only one way to recharge batteries, Efortek features wall, car, and power bank charging for added convenience. 100% Safety Guarantee: Features four layers of protection (over-charging, short-circuit, high-temperature, and surge protection) with a high-quality, fire-resistant construction