YI M1 Mirrorless Digital Camera Battery and Battery Charger(Cable Excluded) YI M1 Camera Battery is a 900mAh Amperex Technology Li-Polymer battery. Charger is compact, lightweight and portable. Fully recharge your YI M1 battery in less than 180 minutes. Charger is simple to use and easy to store, giving your YI M1 even longer to shoot. Only compatible with the YI M1 Mirrorless Camera.