From the Manufacturer:

1. 3.7v 500mAh lithium batteries for Syma X9S Car Quadcopter
2. High quality and lightweight,practical.
3. Durable,rechargeable and works perfectly with the drone.
4. High capacity and long service life
5. Provide your drone continuous power for steady and well-balanced flying
6. Considering that you may have a plurality of batteries, so this additional charging USB cable will help you saving time while charging multiple batteries.

Specifications:

1. Model: X9S
2. Type: Lithium-Ion
3. Suitable for: Syma X9S rc car drone
4. Color: Silver
5. Capacity: 3.7v 500mAh.

Package Includes:

2 x Lithium-Ion Batteries
1 x USB Charger Cable

• Replacement batteries,perfectly compatible with Syma X9S car drone Quadcopter.
• 3.7v 500mAh lithium battery,high quality and well performance.
• Durable and pratical battery, rechargeable with long life using.
• Additional charging USB cable,more convenient for you to charge multiple batteries.
• Included 2 Packs Replacement Batteries and 1 USB Charger

Replacement batteries,perfectly compatible with Syma X9S car drone Quadcopter.Syma