3pcs x 1100mAh Flight Rechargeable Tello Battery Compatible with Ryze Tech DJI Tello Package List You Can Get Three Batteries for Ryze Tello Drone Compatible With This batteries Compatible with Ryze Tello Drone ,Support Original Charger too Battery ParameterCapacity:1100mAh 4.18Wh Max Charge Voltage :4.35V Nominal Voltage :3.8V Battery Cell Composition: Lithium Polymer Battery Battery Safety Built in Protection Mechanism for Safe ,When the Battery Could Not be Charged, Please Load the Battery into Drone and then Connect Drone to Charger. It is to Activate Battery. Time 1 year , have any problem ,Contact us ,We will give you a good solution .