Summary — 7.4V 4000mAh 40C Round Case RC Car Battery

The 7.4V 4000mAh 40C LiPo Battery Round Case for RC Car is a high-performance lithium-polymer pack engineered for demanding RC applications. With high energy density, continuous 40C discharge capability, and a durable round case structure specifically designed for RC car battery compartments, this pack delivers outstanding acceleration, stable output, and long runtime. Even after 500 deep cycles, the battery retains over 3200mAh, offering excellent longevity. Although it has no built-in protection board, the pack features high cell consistency, allowing safe and stable balance charging for hobby-grade and professional RC racing setups.

7.4V 4000mAh 40C Round Case LiPo Battery

Model: CP4000RN40-2S

Battery Type: 2S LiPo Battery

Nominal Capacity: 4000mAh

Nominal Voltage: 7.4V

Energy: 29.6Wh

Energy Density: 140.95Wh/kg

Charge Cut-off Voltage: 8.4V

Discharge Cut-off Voltage: 6V

Standard Charge Current: 0.2C (800mA)

Max Charge Current: 1C (4000mA)

Standard Discharge Current: 0.2C (800mA)

Max Continuous Discharge Current: 40C (160A)

Max Peak Discharge Current: 80C (320A)

Cycle Life: More Than 500 Times

Dimensions: 23.5 × 45.8 × 95 mm

Weight: 210g

Charge Temperature Range: 0°C to 45°C

Discharge Temperature Range: -20°C to 65°C

Storage Temperature Range:

• -20℃~25℃: More than 12 months
• -20℃~45℃: Less than 3 months
• -20℃~60 ℃: Less than 1 month

Charge Connector: JST-XH

Discharge Connector: Bare wires, XT60, T Deans, EC5 etc

Key Features – RC Lipo Batteries​ 7.4V 4000mAh

⚡ High Energy Density for Longer Running Time

This LiPo battery is built with advanced electrode materials that significantly increase energy density. The result is a compact pack that provides longer driving time without adding unnecessary weight. Higher capacity in a compact size, longer RC runtime per charge, lightweight design for better racing performance

🚀 40C High Discharge Rate — Engineered for Extreme Performance

With a continuous 40C discharge rate, this battery supports high-current output, making it ideal for RC cars that require explosive acceleration and stable power at high speed. This allows powerful bursts for racing starts, smooth and stable current delivery, reliable output for brushless motors and Minimal voltage sag during high loads. Perfect for RC racing cars, off-road buggies, drift cars, monster trucks, and other high-power models.

🔵 Round Case Housing — Specially Designed for RC Car Compartments

The durable round case shell is built to fit modern RC car battery trays. Its rigid construction ensures stable mounting, improved impact resistance, and better internal cell protection.

Round case brings:

• Perfect fit for RC standard battery slots

• Enhanced durability for crashes and vibration

• Better internal cell stability

• Improved safety during aggressive driving

🔁 Long Cycle Life — 500 Cycles Retaining Over 3200mAh

This pack is engineered for endurance. Even after 500 full deep cycles, it maintains over 3200mAh, significantly extending its usable life and reducing replacement frequency. You get long-term performance stability, lower cost per cycle, and reliability for frequent racers and hobbyists.

🎯 High Cell Consistency — Excellent for Balance Charging

Although the pack has no built-in protection board, its internal cells are matched with high accuracy. Lower deviation between cells make it more stable discharge characteristics and enhanced lifespan and overall reliability. This makes it suitable for professional RC charging equipment used by RC racers worldwide.

❓ FAQ — 7.4V 4000mAh 40C RC Car LiPo Battery

1. What RC vehicles is this battery compatible with?

It fits most 1/10 and 1/8 RC cars, buggies, trucks, and drift cars that support 7.4V LiPo packs, especially those requiring round-case batteries.

2. Can this battery handle high-current brushless motors?

Yes. With a 40C continuous discharge rating, it supports high-current brushless ESC systems with stable output.

3. Is a protection board included?

No. This pack is designed for professional RC use and does not include PCM/PCB, but it features high cell consistency, making it safe for balance charging.

4. Is balance charging required?

Yes. All RC LiPo packs without PCB should be charged using a professional balance charger for safety and maximum lifespan.

5. How to store lipo batteries​?

Keep them in a cool, dry place away from flammable materials, avoiding fully charged or fully depleted long-term storage.