Feature:1. Lightweight Design: The lightweight design of lithium batteries makes them easy to carry. 7.4V 4000mAh lipo battery provides a perfect combination of weight, power, and performance.2. Protection Function: 7.4V 4000mAh 8C lipo battery has overcharging protection and short circuit protection to ensure the safety of the charging process.3. Provide Long Battery Life: 7.4V 4000mAh 8C lipo battery can provide longer battery life and fully experience the fun brought by toys.4. Wide Application: 2S 7.4V 4000mAh 8C lipo battery is suitable for outdoor playing, safe in normal use, good choice for your rc mode.5. Great Durability: The 7.4V 4000mAh lithium battery casing is durable, sturdy and stable, and has a long service life.Specification:Item Type: 2S 7.4V 4000mAh 8C Lipo BatteryMaterial: Lithium PolymerWeight: Approx. 117g / 4.1ozBattery Capacity: 4000mAh Lithium Battery (Shipped With Pure Battery)Voltage: 7.4V.Package List:1 x Battery