Overview
The Overlander 4400mAh 22.2V 6S 80C Extreme Pro LiPo Battery with EC5 2218 is a premium power solution engineered for serious RC enthusiasts who demand exceptional performance and reliability from their high-powered models. This professional-grade lithium polymer battery delivers the sustained energy output required by large-scale RC aircraft, advanced racing drones, high-performance helicopters, and competitive RC cars that operate at the very limits of what their electronics can handle. Whether you're piloting an EDF jet, flying a scale model, or pushing a racing car to its absolute limits, the Extreme Pro 2218 provides the consistent, rapid power delivery that separates champions from casual pilots.
Built by Overlander Batteries, a recognised manufacturer trusted throughout the UK RC community, this battery represents the pinnacle of LiPo technology for extreme-use applications. The 4400mAh capacity combined with a 22.2V (6S) configuration delivers 97.68 Watt Hours of power in a compact 160 x 49 x 54mm form factor, weighing just 725 grams. This balance between capacity and weight is crucial for maintaining the agility and responsiveness of your RC model whilst providing extended operational time between charges. Unlike entry-level LiPo batteries, the Extreme Pro range is specifically designed for the demands of competitive RC use, where consistent performance, reliability and safety are non-negotiable.
If you're searching for a high-capacity 6S LiPo battery for RC racing UK, a drone battery that can handle sustained high-drain operations, or a helicopter power cell that delivers explosive power when you need it, this Overlander battery is the answer. The 80C constant discharge rate combined with an impressive 140C burst rating means your model won't experience voltage sag during aggressive manoeuvres, ensuring peak performance whether you're executing barrel rolls, high-G turns, or flat-out acceleration runs.
Key Features
- 4400mAh Capacity — This substantial energy reservoir provides extended run times for your RC model, allowing you to enjoy longer flights, longer drives, or longer operational periods between charges compared to smaller-capacity batteries, giving you more time to perfect your skills and enjoy your hobby.
- 22.2V Output (6S Configuration) — The six-cell setup delivers serious, consistent power that large-scale RC models demand, with enough voltage to drive demanding motors, ESCs and servo systems whilst maintaining stable voltage throughout most of your operating session until the battery is nearly depleted.
- 80C Constant Discharge Rate — This exceptional discharge rating ensures rapid and reliable energy flow to your model's motor, supporting aggressive manoeuvres, sharp acceleration and the complex flight patterns or racing lines that competitive RC use demands, without the battery becoming a limiting factor in your model's performance.
- 140C Burst Discharge Rating — The burst capability provides a bonus power boost for those critical moments when you need maximum thrust or torque, such as a hard racing corner, a vertical climb, or an all-out sprint, giving you the extra power for just a few seconds when it matters most.
- Maximum Constant Current of 352A — This specification indicates the battery can continuously supply up to 352 amps of current, ensuring that even high-powered motors operating at full demand receive stable, uninterrupted power delivery without voltage collapse.
- Maximum Burst Current of 616A — In peak demand situations, the battery can briefly supply up to 616 amps, enabling explosive power for those fraction-of-a-second moments where maximum thrust or torque is required for performance.
- EC5 Connector — This high-quality connector provides secure, efficient power transfer between the battery and your RC equipment, with excellent conductivity and a reliable mechanical fit that ensures your model receives consistent power without connection losses or dangerous disconnections during operation.
- Compact Physical Dimensions — Measuring 160mm in length, 49mm in width and 54mm in depth, this battery fits into many competitive-level RC models without requiring major restructuring or weight distribution changes, allowing you to maintain your model's intended balance and handling characteristics.
- Lightweight at 725 Grams — Despite its powerful specifications, the battery weighs less than 750 grams, ensuring your RC model remains nimble, responsive and agile, particularly important for flight performance in drones and aircraft where every gram affects manoeuvrability and flight time.
- Extreme Pro Series Designation — Overlander's Extreme Pro range represents their highest standard for durability, consistency and performance, engineered specifically for users who need equipment that won't let them down during critical competitions, training sessions or intense recreational flying and driving.
- 8AWG Wire Gauge — The thick 8AWG power leads minimise resistance and voltage drop, ensuring that power reaches your motor and ESC with minimal loss, which is essential for achieving the full potential of your high-performance RC equipment.
- JST-XH Balance Connector — The integrated balance lead allows use with compatible LiPo chargers that monitor and individually balance each of the six cells, maintaining optimal cell voltage across the entire battery and maximising lifespan and safety.
Technical Performance
The Overlander 4400mAh 22.2V 6S 80C Extreme Pro LiPo Battery represents a sophisticated engineering solution for high-demand RC applications. With 97.68 Watt Hours of energy stored within its 725-gram package, this battery delivers the power density required by modern brushless motor systems whilst maintaining a weight profile that doesn't compromise the agility of large-scale RC models. The 80C constant discharge rate of 352 amps combined with the 140C burst capability of 616 amps positions this battery at the professional end of the LiPo spectrum, suitable for EDF jets, high-performance racing drones, advanced scale model aircraft, and competitive RC cars that demand exceptional power delivery. The construction utilises lithium polymer cell chemistry, which provides superior energy density compared to older NiMH or NiCd technologies, meaning more power and longer run times without excessive weight penalty. The JST-XH balance connector and 8AWG power leads indicate quality manufacturing standards, with the thick gauge wiring specifically chosen to minimise voltage drop during high-current operations and the balance connector enabling proper cell management during charging. This battery is built to withstand regular use in demanding competitive environments where consistent performance, reliability and safety are absolutely critical. The EC5 connector ensures secure connectivity with high-current RC systems, providing excellent conductivity and a mechanical fit that inspires confidence during intense operations. For users of large-scale RC aircraft, advanced racing drones, high-powered helicopters, or competitive RC cars operating in the UK, this battery bridges the gap between casual recreational equipment and professional-grade power solutions.
What's in the Box
- Overlander 4400mAh 22.2V 6S 80C Extreme Pro LiPo Battery
- EC5 Connector with power leads (8AWG gauge)
- JST-XH Balance Connector
What You Need to Complete
- Compatible LiPo Battery Charger with LiPo mode and balance charging capability — Essential for safe charging of this battery and to ensure each of the six cells is properly balanced for optimal performance and lifespan.
- RC Model compatible with 22.2V (6S) LiPo batteries — You must verify that your specific RC model's motor, ESC (Electronic Speed Controller) and other electronics are rated for 6S operation before using this battery.
- Voltage Checker or Battery Monitor (optional but recommended) — A device to monitor individual cell voltages will help you track battery health and ensure you never over-discharge below the safe minimum of 3.0V per cell.
- LiPo Battery Storage Box (optional but recommended) — A fireproof storage container provides safety during storage and charging, protecting your home and equipment in the unlikely event of battery failure.
- Charging Cable Adaptor (if your charger doesn't already have EC5 compatibility) — May be required depending on your specific charger model.
Understanding LiPo Batteries and Why They Power Modern RC Models
Lithium Polymer (LiPo) batteries have become the standard power source for RC models throughout the UK and worldwide, and for excellent reasons. Unlike older Nickel-Metal Hydride (NiMH) or Nickel-Cadmium (NiCd) batteries, LiPo cells pack significantly more energy into a smaller, lighter package, delivering the high-power bursts essential for modern RC performance. A LiPo battery offers high energy density, meaning more power and longer run times without excessive weight that would compromise your model's agility. LiPo batteries are remarkably lightweight compared to older chemistries, which keeps RC models nimble and responsive — critically important for flight performance in drones, planes and helicopters, and for handling and acceleration in RC cars. These batteries can deliver quick bursts of power for rapid acceleration, sharp turns, complex three-dimensional manoeuvres and competitive performance that older battery types simply cannot match. With higher capacities measured in milliampere-hours (mAh), LiPo batteries offer extended playtime between charges, letting you enjoy longer flights or driving sessions. Unlike older NiCd batteries, LiPo cells have no memory effect, meaning you can safely top them up any time without losing capacity. They charge faster than alternative battery types, getting you back to flying or racing quickly. LiPo batteries maintain steady voltage throughout most of their discharge cycle, ensuring your model performs consistently until the battery approaches depletion. Finally, these batteries come with various popular connector options including EC5, XT60, and others, giving you flexibility to match different RC setups.
Key Specifications Explained: mAh, Voltage and C Rating
Understanding battery specifications is essential for choosing the right power solution. The "mAh" (milliampere-hour) rating measures the battery's capacity, or how much energy it can store — essentially, how much total power is available. A higher mAh means longer run times, so if you want your RC model to fly or drive for extended periods, a higher mAh rating is advantageous. However, higher capacity batteries tend to be heavier, so finding the right balance between capacity and weight depends on your specific model's requirements. The voltage shown as "S" (for series) indicates the battery's power push — more cells mean higher voltage. A 6S battery like this Overlander delivers more speed and quicker response than lower-voltage options, but it's absolutely crucial to verify that your specific RC model's motor, speed controller and other electronics can handle the voltage. Not all RC models are designed for high voltages, and using too much voltage can damage electronics or cause poor performance. Always check your model's specifications to ensure the voltage matches your application, keeping your model running safely and efficiently. The "C" rating is your battery's power meter, showing how fast it can deliver energy when you're pushing your RC model hard. An 80C battery releases power faster than a 20C battery, giving your model faster acceleration, snappier response and the ability to handle quick, sharp manoeuvres. The burst rating is the bonus power boost that kicks in for short moments when you really need it — while the constant C rating tells you what the battery handles continuously, the burst rating is your battery's "turbo mode" for those critical seconds. For high-performance models like racing drones, aerobatic planes or RC cars competing at a serious level, a higher C rating and burst capacity are essential, ensuring your battery keeps up with demand and stays ahead of the competition.
Choosing the Right Battery for Your RC Model
Selecting the perfect battery for your RC model involves understanding how mAh capacity, voltage, and C rating work together with your specific equipment. Start by consulting your RC model's manual or manufacturer specifications — these will tell you the recommended battery capacity range (mAh), compatible voltage (S configuration), and ideal C rating for your particular setup. The mAh capacity should balance between your desired run time and your model's weight constraints — too heavy a battery can negatively impact performance, whilst too small a capacity will have you returning to the charging station too frequently. Voltage compatibility is non-negotiable — your motor, ESC (speed controller) and other electronics must be rated for the battery's voltage to prevent damage. The C rating must match your model's power demands; competitive racing drones and aerobatic planes need higher C ratings to deliver the necessary performance, whilst lighter recreational models might operate perfectly well with lower ratings. Always verify that the battery's physical dimensions will fit your model without disrupting its balance or aerodynamics. Every RC model has unique requirements, so always refer to your specific model's application guidelines and manufacturer recommendations. When in doubt, consult the RC Model Shop team — our experienced RC enthusiasts can guide you toward the safest and most effective battery for your setup.
Safe Charging, Discharging and Storage of LiPo Batteries
LiPo batteries require specific care to maintain safety, performance and longevity. Always use a charger specifically designed for LiPo batteries and set to LiPo mode — these special balance chargers do far more than simply fill the battery; they ensure each individual cell is charged equally, keeping everything balanced and healthy. A balanced charge is critical for consistent performance, optimal battery lifespan and safe operation. Using a regular charger or setting the wrong chemistry mode is genuinely dangerous, potentially leading to overcharging, uneven cell voltages or serious safety hazards including overheating or fires. LiPo batteries are sensitive to incorrect voltage, making proper charging equipment essential, not optional. Our Overlander batteries include a balance lead (the JST-XH connector) specifically for use with compatible chargers to monitor and adjust each cell individually, providing an extra layer of protection that keeps your battery operating at its best. Always ensure your charger recognises LiPo mode and never charge on the wrong setting. For storage, keep your LiPo batteries at approximately 50 percent charge (about 3.7V to 3.85V per cell), as LiPo cells don't like being fully charged or completely drained for extended periods — the 50 percent state keeps cells happy and healthy during storage. Store batteries in a cool, dry place away from heat sources, direct sunlight and hot vehicles, as heat damages LiPo cells. Check stored batteries every couple of months and give them a quick top-up or discharge to that 50 percent sweet spot to maintain readiness. Never let your LiPo battery drain completely below its minimum safe voltage, typically around 3.0V per cell — over-discharging causes permanent damage, making the battery unable to hold a charge or unsafe to use.
Understanding Overcharging, Over-Discharging and Battery Safety
Overcharging occurs when you charge a LiPo battery beyond its maximum safe voltage, typically 4.2V per cell, and causes serious problems. Overcharged cells swell and become unstable, potentially leading to battery failure, leaks, reduced capacity or even fires. This is why using a charger with a built-in voltage cut-off is your first line of defence — it automatically stops charging at the correct point. Over-discharging (draining below 3.0V per cell) causes equally severe damage; LiPo batteries don't bounce back easily from over-discharge and cells damaged in this way may never charge properly again. Since LiPo batteries lack built-in circuits to prevent over-discharge, it's your responsibility to stop using them before they drop too low — a voltage checker helps you monitor battery charge and keep it within safe limits. Both overcharging and over-discharging are not merely performance issues; they're genuine safety concerns. Batteries subjected to these extremes can become volatile, leading to swelling, leaks or fires. Always use a proper LiPo charger with voltage cut-off, and if your RC equipment lacks built-in voltage detection, a separate voltage checker is essential. Treating your LiPo batteries with care — avoiding both extremes and using proper equipment — keeps them safe, performing at their peak, and ready for action whenever you are.
Maximising LiPo Battery Lifespan and Performance
Keeping your LiPo batteries running strong and lasting longer is entirely within your control through proper care and attention. Avoid overcharging by using a charger with automatic voltage cut-off — think of overcharging as overfilling a balloon; eventually it bursts. Charging beyond the safe limit of 4.2V per cell stresses the cells and leads to swelling, leaks and failure. Never over-discharge your battery below 3.0V per cell; draining it completely is like running your car out of petrol, leaving you stranded and potentially causing permanent, irreversible damage. Stop using your battery well before it reaches this critical low point. For storage between uses, maintain your battery at approximately 50 percent charge (around 3.7V to 3.85V per cell) — this sweet spot keeps cells healthy during idle periods. Check stored batteries every couple of months and adjust the charge as needed to maintain that 50 percent level, ensuring they're always ready when you want to fly or drive. Store batteries in cool, dry locations away from heat sources, direct sunlight and vehicles left in the sun. Use only the correct charger set to LiPo mode, and utilise the balance connector to ensure all cells charge equally. Monitor your battery during use, watching for signs of swelling, damage or unusual behaviour, and retire any battery that shows signs of damage or stress. By treating your LiPo batteries with proper care and respect, you'll enjoy better performance, longer lifespan and the reliability that separates champions from casual users.
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 4400mAh 22.2V 6S 80C Extreme Pro LiPo Battery with EC5 2218 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.
