What are the battery specification and charging requirements with YI 4K+ Action Camera?

YI uses the world's leading rechargeable 1200mAh high-voltage 4.4V lithium-ion battery to record up to 120 minutes of 4K/30fps video with a single charge. An innovative heat management system helps release heat quickly to reduce overheating while recording charging Requirements: Input current 1A   Output voltage 5V
It is recommended to use a 2A input current power adapter for charging.