Application: These batteries are perfectly suited for a variety of 3.7V RC models and toys, including airplanes, trucks, boats, drones, and helicopters. Capacity: 550 mAh. Unit Quantity: 2 Expiry Date: Lipo Battery for RC Toys Application: High Drain Devices,RC Plane,Helicopter,Drone,Toys,Airplane,Truck,Boat Type: Li-Po.