From the Manufacturer:
1. 3.7V 500mAh lithium batteries for UDI RC UDI U817 U817C U817A U818A Quad Copter.
2. Charge 2 batteries at the same time by using the original USB charging box which has 2 output interfaces.
3. High quality and lightweight,practical.
4. Durable,rechargeable and works perfectly with the drone.
5. High capacity and long service life.
6. Provide your drone continuous power for steady and well-balanced flying.
1. Model: U818A
2. Type: Lithium-Ion
3. Suitable for: UDI RC UDI U817 U817C U817A U818A Quad Copter
4. Color: Silver
5. Capacity: 3.7V 500mAh.
6. Battery Dimensions: 2.4″*1.3″*0.4″, 0.6oz
7. USB Charger Dimensions: 2.4″*0.7″0.3″, 0.4oz
2 x Lithium-Ion Batteries
1 x USB Charger Box
Replacement batteries,perfectly compatible with UDI RC UDI U817 U817C U817A U818A Quad copter.
3.7v 500mAh lithium battery,high quality and rechargeable performance.
Durable and pratical battery, rechargeable with long life using.
Quick charging,charge 2 batteries at the same time by using the original USB charging box which has 2 output interfaces.
Package include: 2pcs U818a batteries+1pcs USB charging box