If you’re into high-performance RC cars, racing drones, FPV quadcopters, aeroplanes, or robotics, you know one thing for sure—power matters. And when it comes to power delivery, acceleration, and reliability, few options match the performance of a 4S LiPo battery equipped with an XT90 connector.

The 4S configuration delivers an excellent balance of voltage and efficiency, while the XT90 connector ensures safe, reliable high-current handling. Together, they create the perfect combination for demanding RC applications where consistency and safety are essential.

In this article, we’ll explore what makes the 4S LiPo XT90 battery a top choice for hobbyists and professionals, including its benefits, performance advantages, common applications, safety tips, and how to choose the right one for your setup.

Understanding the Basics — What Is a 4S LiPo XT90 Battery?

What Does “4S” Mean?

A 4S LiPo battery contains four lithium polymer cells connected in series, each with:

• 3.7V nominal voltage

• 4.2V full charge voltage

This produces a battery with:

• 14.8V nominal

• 16.8V maximum

This voltage level is ideal for high-power setups because it provides stronger torque, better acceleration, and improved efficiency over lower-voltage batteries like 2S or 3S.

What Is an XT90 Connector?

The XT90 connector is a high-current connector built to handle demanding power loads up to 90 amps continuous. It features:

• Thick gold-plated bullet connectors

• High heat resistance

• Secure, anti-loosening design

• Low resistance for efficient power transfer

• Optional anti-spark variants (XT90-S)

Compared to smaller connectors like XT60, the XT90 is safer and more reliable for large RC vehicles and powerful motors.

Why a 4S LiPo XT90 Battery Is Ideal for High-Power RC Applications

1. High Voltage Means High Power

A 4S battery delivers a noticeable performance upgrade. The increased voltage provides:

• Faster throttle response

• Improved acceleration

• Better lift for drones and aircraft

• Greater torque for RC trucks and buggies

For RC enthusiasts who want more punch, 4S is often the ideal middle ground between power and manageability.

2. Handles High Current Loads Safely

When paired with an XT90 connector, the 4S LiPo becomes a powerhouse capable of safely delivering high currents without overheating.

This is critical for:

• Brushless motors

• High-RPM drone setups

• 1/8 scale RC cars

• Racing ESCs (Electronic Speed Controllers)

The XT90 ensures a secure connection and minimal resistance, preventing dangerous voltage drops under load.

3. Consistent Voltage Under Heavy Loads

One of the main advantages of LiPo batteries is their ability to maintain voltage even during rapid bursts of acceleration or lift.

Low internal resistance helps:

• Maintain stable performance

• Reduce brownouts in drones

• Provide smoother throttle control

• Improve overall efficiency

This consistency is crucial for racing, freestyle FPV, and high-demand RC setups.

Advantages of Using a 4S LiPo XT90 Battery

High Discharge Rates (C Rating)

4S LiPo batteries come with high discharge rates ranging from 50C to 150C.
This makes them capable of delivering sudden bursts of power, which is essential for:

• Quick acceleration in RC cars

• Punch-outs in FPV drones

• Aerobatic manoeuvres in planes

A higher C rating means more power and less heating under stress.

Lightweight and Compact Design

Compared to other high-voltage options like 5S or 6S, 4S LiPos are:

• Lighter

• More compact

• Easier to mount

• More efficient for mid-range power setups

This weight-to-power ratio makes them popular among drone pilots and RC racers.

Universal Compatibility

4S LiPo XT90 batteries are widely used in:

• 1/8 scale RC cars

• FPV drones (5–7 inch)

• RC planes & wings

• Robots and DIY electronics

• High-performance RC boats

The XT90 connector is also supported by many ESCs and chargers, making it a convenient universal solution.

Safer, More Durable Connection

The XT90 connector is designed to prevent:

• Sparks during connection

• Melting under load

• Loose connections

• Connector wear

This greatly increases safety, especially in high-current, high-speed RC applications.

Where 4S LiPo XT90 Batteries Are Most Commonly Used

Racing RC Cars

These batteries provide:

• Outstanding torque

• Rapid acceleration

• Smooth throttle control

Perfect for off-road buggies, monster trucks, and track racers.

FPV Drones & Quadcopters

4S is the sweet spot for:

• 5-inch freestyle quads

• Long-range drones

• FPV racing drones

They deliver strong performance without the excessive weight of 6S batteries.

RC Planes & Wings

4S offers:

• Longer flight times

• Smooth, linear power

• Excellent power-to-weight balance

Great for aerobatics and medium-size aircraft.

Robotics & DIY Power Systems

Robotics engineers use 4S LiPo XT90 batteries due to their stability and high discharge capabilities.

How to Choose the Right 4S LiPo XT90 Battery

1. Capacity (mAh)

Ideal capacities:

• RC Cars: 5000–8000 mAh

• FPV Drones: 1300–1800 mAh

• RC Planes: 2200–5200 mAh

Higher capacity = longer runtime
But also more weight.

2. Discharge Rating (C Rating)

• Minimum 50C for high-performance setups

• 80C+ recommended for racing quads and RC buggies

3. Connector Type

Choose between:

• XT90 (standard)

• XT90-S (anti-spark variant)

4. Brand Reputation

Popular and reliable brands include:

• CNHL (China Hobby Line)

• Gens Ace

• Tattu

• Zeee

• Ovonic

5. Charger Compatibility

Always use a balance charger:

• ISDT

• SkyRC

• ToolkitRC

Charge at 1C unless otherwise approved by the manufacturer.

Safety Tips for Handling 4S LiPo XT90 Batteries

Charging Safety

• Always balance-charge

• Never charge unattended

• Avoid charging above 4.2V per cell

• Use fireproof LiPo bags

Storage Safety

• Store at 3.8V per cell (storage mode)

• Keep in a cool, dry place

• Avoid punctures and swelling

Signs You Must Replace the Battery

Replace immediately if:

• Pack is puffy

• Cells are unbalanced

• Wires or connectors are damaged

• Voltage drops rapidly under load

Common Mistakes to Avoid

• Using an ESC with insufficient amp rating

• Over-discharging below 3.2V per cell

• Fast-charging repeatedly beyond safe limits

• Using adapters that restrict current flow

• Ignoring battery temperature during use

4S vs 3S vs 6S: Which Is Best?

4S offers the ideal combination of speed, efficiency, and handling.

Conclusion

A 4S LiPo XT90 battery is one of the most reliable and efficient power solutions for high-performance RC setups. Whether you’re flying drones, racing RC cars, powering RC planes, or building robotics projects, a 4S XT90 battery provides:

• High voltage

• Stable current delivery

• Great efficiency

• Enhanced safety

• Excellent compatibility

Its balance of power and weight makes it a favourite among hobbyists who want performance without compromise. If you need strong acceleration, smooth throttle response, and durable connections, the 4S LiPo XT90 is the perfect choice for you.

FAQs

1. Is a 4S LiPo better than a 3S for RC cars?

Yes, 4S provides more voltage, faster acceleration, better torque, and smoother power delivery.

2. What capacity is best for FPV drones?

For 5-inch quads, 1300–1800 mAh is ideal depending on your flying style.

3. Is XT90 better than XT60?

Yes, XT90 handles higher current and is safer for powerful RC setups.

4. Can I use an XT90-to-XT60 adapter?

Yes, but it's not recommended for high-current applications due to heat and resistance issues.

5. How long does a 4S LiPo last?

Typically 150–250 cycles with proper care.

6. How do I store my LiPo battery safely?

Store at 3.8V per cell in a fireproof container at room temperature.

7. What is the safe charging rate for 4S LiPo batteries?

1C is recommended for optimal battery life unless the manufacturer suggests otherwise.