Overlander Sport 1800mAh 3S 11.1V 25C LiPo Battery EC3 Connector 2995EC3

Overview

The Overlander Sport 1800mAh 3S 11.1V 25C LiPo Battery with EC3 Connector is a precision-engineered power solution designed for RC enthusiasts across the UK who demand reliability, consistent performance and exceptional value. Whether you're flying sport planes, practicing aerobatic manoeuvres, racing lightweight drones or powering your RC car, this battery delivers the stable power output and dependable energy flow that separates quality equipment from the rest. Built with high-quality Fullymax cells and precision-matched internal resistance, voltage and weight, this battery ensures balanced energy output and extended battery life that RC hobbyists have come to expect from the Overlander Sport range.

At just 137 grams and measuring a compact 89 x 34 x 21mm, this 3S LiPo strikes the perfect balance between performance and practicality for models where space and weight are critical considerations. The 1800mAh capacity provides extended runtime without excessive bulk, making it ideal for RC enthusiasts who prioritise control, manoeuvrability and smooth operation during practice sessions or leisure flights. Whether you're an experienced RC car UK competitor or exploring the world of RC flight for the first time, this battery has been engineered to deliver consistent, responsive power exactly when you need it most.

The Overlander Sport 1800mAh LiPo is particularly well-suited to sport planes, aerobatic aircraft, high-performance racing drones and lightweight RC models where both efficiency and reliability are essential. The 25C continuous discharge rate combined with 45C burst capability ensures your model maintains responsive throttle control and explosive acceleration during demanding manoeuvres, whilst the precision-matched cells guarantee consistent performance across every flight, drive or run.

Key Features

• 1800mAh Capacity with 11.1V Power — This lightweight capacity provides practical extended runtimes for smaller and medium RC models whilst maintaining the responsiveness needed for sport and aerobatic applications. The 11.1V setup (3S configuration) delivers more voltage and power compared to 2S packs, giving your RC models faster acceleration, improved performance and wider compatibility across the popular RC cars, planes and helicopters commonly used in the UK RC hobby community.
• 25C Continuous Discharge with 45C Burst Rating — The 25C discharge rate ensures safe and effective delivery of steady bursts of power for most RC applications, providing responsive throttle control and consistent acceleration suitable for casual racing, flight practice and general recreational RC activities. The 45C burst rating gives you bonus power for short intense moments—during tight corners, sudden climbs or all-out sprints—ensuring your battery doesn't just keep up but stays ahead when you need it most, delivering maximum current of 45A continuously and 81A in burst mode.
• Compact and Lightweight Design — Weighing only 137 grams and measuring 89 x 34 x 21mm, this battery is engineered for tight spaces and lighter setups where power and performance are crucial without adding unnecessary bulk. The reduced weight helps maintain balance and responsiveness in your RC model, ensuring smoother operation whether you're practicing or enjoying leisure use.
• Precision-Matched Fullymax Cells — Each cell is carefully matched in internal resistance, voltage and weight using industrial-grade equipment to ensure balanced energy output, consistent performance and reduced risk of overheating. This precision engineering delivers dependable operation over time and extends the battery's overall lifespan, making this Sport range battery a smart investment for everyday reliability.
• EC3 Connector — The EC3 connector is recognised for its safe and secure fit, featuring a reliable connection mechanism that provides low-resistance power transfer and the ability to handle moderate current levels efficiently. The connector's positive and negative terminals are clearly marked, making connections foolproof and reducing the risk of reverse polarity damage to your RC equipment.
• Ultrasonic Welded Construction — The connection between nickel and aluminium tabs is strengthened using ultrasonic welding, providing greater durability and reliability than standard soldering methods. This engineering approach ensures the battery can withstand the vibrations, impacts and demanding conditions typical of RC use.
• High-Quality Silicone Leads with Gold-Plated Connectors — The multi-strand silicone leads ensure efficient power transfer from the battery to your RC model, whilst gold-plated connectors provide reliable connections that resist corrosion and maintain consistent electrical contact throughout the battery's lifetime.
• Protective Padding — The battery is surrounded by protective padding that shields it from minor bumps and knocks during storage, transportation and use, enhancing durability without adding unnecessary bulk to the overall package.
• No Memory Effect and Low Self-Discharge — Unlike older battery chemistries, these LiPo cells deliver more charge cycles and extended lifespan with minimal downtime. You can top up the battery at any time without losing capacity, and the battery maintains its charge for longer periods between uses.
• Balance Connector Type JST-XH — The included balance connector allows proper cell balancing during charging, which is essential for maintaining cell health, extending battery life and ensuring safe operation. Always use a compatible LiPo charger with balance charging capability to keep this battery in optimal condition.
• Multiple Connector Options Available — Whilst this model features the EC3 connector, the same battery is available with Deans and XT60 connectors, providing flexibility to match your existing RC setup and ensuring seamless compatibility across your fleet of models.

Technical Performance

This Overlander Sport LiPo battery represents precision engineering at its finest. With a 19.98Wh energy capacity and 14AWG (2.5mm) wire gauge, the battery delivers consistent, regulated power to demanding RC applications. The 25C continuous discharge rating translates to a maximum continuous current output of 45 amps, whilst the 45C burst rating allows peak currents of 81 amps for short durations—exactly the performance envelope needed for sport planes executing aggressive aerobatic manoeuvres, lightweight drones performing rapid acceleration, or RC cars requiring explosive throttle response. The 3S (3-cell) lithium polymer configuration provides 11.1V nominal voltage, which is widely compatible with standard RC speed controllers, motors and electronic systems found in popular ready-to-run RC models across the UK hobby market. The battery's internal resistance has been matched using industrial-grade testing equipment to ensure all cells operate at the same efficiency level, reducing stress on individual cells and preventing the uneven discharge patterns that can lead to premature cell failure or overheating. The ultrasonic welding of the nickel and aluminium tabs creates a stronger connection than traditional soldered joints, capable of withstanding the continuous vibration and thermal cycling inherent to RC operation. The high-quality silicone leads are rated for the full discharge current the battery can deliver, ensuring no energy is lost to resistance in the power delivery path. This battery has been thoroughly tested to ensure reliable performance across extended charge and discharge cycles, making it a dependable choice for anyone serious about consistent RC performance.

What's in the Box

• Overlander Sport 1800mAh 3S 11.1V 25C LiPo Battery
• EC3 Connector with pre-soldered leads
• JST-XH Balance Connector for charging

What You Need to Complete

• LiPo-compatible balance charger (set to LiPo mode) — essential for safe and proper charging
• LiPo safety charge sack — highly recommended for safe charging, storage and transport
• RC model compatible with 3S 11.1V power systems and EC3 connector (or an EC3 adapter if your model uses a different connector)

Frequently Asked Questions

• Is the Overlander Sport 1800mAh 3S LiPo battery suitable for beginners? — Yes, this battery is an excellent choice for RC beginners. The 1800mAh capacity provides practical runtimes without excessive weight, whilst the 25C discharge rate is safe and forgiving for learning pilots and drivers. The compact size and lightweight design help beginner-level models maintain good balance and responsiveness. However, you will need a dedicated LiPo charger with balance charging capability and basic knowledge of LiPo safety practices.
• What RC models is this battery compatible with? — This 3S 11.1V battery is compatible with sport planes, aerobatic aircraft, lightweight drones, RC cars, helicopters and RC boats that are specifically designed for 3S LiPo power. Always verify that your model's speed controller (ESC) and motor are rated for 11.1V three-cell operation before using this battery. Check your model's user manual for the recommended battery specifications.
• How long will this battery last per charge? — Runtime depends on your specific RC model's motor, load and flight or driving style. The 1800mAh capacity combined with the 11.1V voltage provides extended runtimes compared to 2S batteries. Typically, you can expect 8-15 minutes of flight time in sport planes or 15-30 minutes of driving time in RC cars, though these figures vary significantly based on your model's efficiency and how aggressively you operate the throttle.
• Why do I need a special LiPo charger? — LiPo batteries require a dedicated balance charger to ensure each of the three cells charges to the same voltage level. Using a standard charger designed for older NiMH batteries can result in overcharging, uneven cell charging, or serious safety hazards including overheating and fires. A proper LiPo charger monitors and adjusts each cell individually through the balance connector, keeping everything in perfect equilibrium and extending the battery's lifespan significantly. Always ensure your charger is set to LiPo mode before connecting this battery.
• What is the difference between the 25C continuous rating and the 45C burst rating? — The 25C rating is what this battery can safely deliver continuously throughout your flight or drive session without thermal stress or damage. This equates to 45 amps of continuous current output. The 45C burst rating is a temporary power boost available for short periods—just a few seconds—when you need maximum acceleration or aggressive manoeuvring. This equates to 81 amps peak current. Think of continuous rating as your normal cruising power and burst rating as your turbo mode for brief, intense moments.
• How should I store this battery when not in use? — Store this LiPo battery at approximately 50% charge (around 3.7V to 3.85V per cell) in a cool, dry location away from direct sunlight, heat sources and damp conditions. Never store the battery fully charged or completely drained, as both states stress the cells and reduce lifespan. Check the battery's charge level every two months during extended storage periods and bring it back to 50% charge if needed. Use a LiPo safety charge sack during storage for added protection.
• What does the EC3 connector mean? — The EC3 connector is a three-pin connector system (Elektronik-Collector 3-pin) that safely and securely connects your LiPo battery to your RC model's speed controller. The connector design prevents accidental reverse polarity connections that could damage your equipment. The EC3 is lighter and more compact than larger connectors like XT60, making it ideal for smaller models where every gram counts.
• Can I use this battery with my existing RC model? — This depends on your model's voltage rating and connector type. Check your RC model's user manual to confirm it accepts 3S 11.1V batteries. If your model uses a different connector (Deans, XT60, or others), you will need an EC3 to [your connector] adapter, or you can purchase the Overlander 1800mAh battery in your preferred connector type. Never force a connector to fit—always ensure proper compatibility before use.
• How many charge cycles will this battery last? — With proper care including balanced charging, correct storage at 50% charge, and avoiding over-discharge below 3.0V per cell, this precision-matched Overlander battery can provide hundreds of charge cycles. Most users report 300-500 complete charge cycles before noticeable capacity reduction occurs. Replacing the battery every 1-2 years of regular use is typical for recreational RC flyers and drivers.
• Why is this battery better than cheaper alternatives? — Overlander Sport LiPo batteries use premium Fullymax cells with precision-matched internal resistance, voltage and weight verified by industrial-grade equipment. This matching ensures balanced energy output, consistent performance and reduced overheating risk compared to batteries using mismatched cells. The ultrasonic welding, multi-strand silicone leads and gold-plated connectors provide superior durability and reliability. You're investing in a battery that will deliver consistent performance and extended lifespan, making it better value than cheaper alternatives despite the initial higher cost.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the Overlander Sport 1800mAh 3S 11.1V 25C LiPo Battery – EC3 Connector – 2995EC3 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.