Overlander 5300mAh 11.1V 3S 65C Hard Case Sport Track LiPo Battery (EC5) – 3143

Overview

The Overlander 5300mAh 11.1V 3S 65C Hard Case Sport Track LiPo Battery (EC5) is a premium power solution engineered for serious RC enthusiasts who demand uncompromising performance, durability and reliability. Whether you're competing in races or pushing your RC car UK setup to its absolute limits, this 3S LiPo battery delivers the consistent power and sustained energy output required for high-demand applications. Built with precision-matched Fullymax cells and encased in a protective reinforced ABS hard shell, this battery is specifically designed for 1/10 and 1/8 scale RC cars, buggies, monster trucks and off-road bashers that require extreme performance under pressure.

This isn't just another LiPo battery—it's engineered for competitive environments where reliability matters and performance can't be compromised. The 5300mAh capacity ensures extended run times between charges, whilst the 65C continuous discharge rate (with a 120C burst capability) provides the explosive power needed for rapid acceleration, sharp cornering and demanding high-speed manoeuvres. If you're running a brushless motor setup or high-performance ESC, this battery will keep pace with your demands and deliver consistent voltage throughout your driving session.

The Overlander 3143 is the choice of racers and serious hobbyists across the UK RC car scene who understand that battery quality directly impacts performance and longevity of their models. With its hard case protection, EC5 high-current connector and quality construction, this battery stands ready for whatever you throw at it—whether that's competitive track racing, weekend bashing, or serious off-road adventures.

Key Features

• 5300mAh Capacity — This generous capacity ensures extended runtime between charges, allowing you to enjoy longer driving sessions without constantly returning to the charger. Higher capacity means more playtime and better value for money, particularly important for serious racers and weekend enthusiasts who want to maximise their track or bash time.
• 11.1V 3S Format — The 3S (three-cell) configuration delivers 11.1V of nominal power, the ideal voltage for most 1/10 and 1/8 scale RC cars, trucks and buggies. This voltage sweet spot provides sufficient power for high-speed performance whilst remaining compatible with the vast majority of brushless motor and ESC combinations in the market.
• 65C Continuous Discharge Rate — This continuous rating of 65C means the battery can reliably deliver 344.5A of sustained current, providing the stable, consistent power needed for demanding driving sessions. Whether you're racing competitively or bashing hard through rough terrain, this discharge rate ensures your motor receives steady power without voltage sag affecting performance.
• 120C Burst Discharge Rating — The impressive burst rating of 120C (636A peak current) provides temporary power boosts for those critical moments—hard acceleration, climbing steep inclines, or executing tight racing lines. This burst capacity gives you extra headroom when you need it most, ensuring your model responds instantly to throttle input.
• Reinforced ABS Hard Case — The tough protective hard shell safeguards your battery against impacts, track debris, handling stress and the inevitable crashes that come with competitive RC racing. This hard case design not only protects the cells from physical damage but also extends the overall lifespan of the battery by keeping the pack structurally intact through countless sessions.
• Fullymax Precision Cells — Overlander's partnership with Fullymax ensures that every cell is precision-matched by voltage, internal resistance and weight. This meticulous cell matching results in smoother, more balanced discharges, reduced heat buildup during use, and extended cycle life, giving you consistent performance run after run without degradation.
• EC5 High-Current Connector — The EC5 connector is specifically designed to handle high-current applications, delivering superior conductivity and significantly reduced electrical resistance compared to standard connectors. This means less heat generation during heavy use, more efficient power delivery to your motor, and better overall performance during intense driving sessions.
• 10 AWG Silicone Wire Leads — The substantial 10 AWG silicone-insulated wire leads provide excellent electrical conductivity whilst maintaining flexibility. These quality leads minimise voltage drop and heat loss, ensuring maximum power reaches your motor exactly when you need it, and the silicone insulation offers superior durability compared to standard PVC wire.
• JST-XH Balance Connector — The integrated JST-XH balance plug allows you to monitor and equalise cell voltage across all three cells during charging. This balance charging capability is essential for maintaining long-term battery health, ensuring each cell charges evenly and preventing cell imbalance that could otherwise reduce performance or create safety hazards.
• Multiple Connector Options Available — Whilst this specific model comes pre-fitted with the EC5 connector, alternative versions with Deans (T-plug), XT90 and Traxxas connectors are available upon request from Overlander. This flexibility ensures you can match the battery connector to your existing RC car UK setup without needing adapters, simplifying installation and eliminating potential points of failure.

Technical Performance

The Overlander 5300mAh 11.1V 3S 65C Hard Case Sport Track LiPo Battery represents the pinnacle of LiPo battery engineering for competitive RC car racing and high-demand applications. With a continuous discharge rate of 65C delivering 344.5A and a burst rating reaching 120C with a peak current of 636A, this battery is engineered to handle extreme loads without voltage sag. The battery's total energy output is rated at 58.85 watt-hours, providing substantial power reserves for extended driving sessions. The precision-matched Fullymax cells ensure that voltage, internal resistance and weight are perfectly balanced across all three cells, eliminating the common problem of uneven cell discharge that plagues lesser-quality batteries. This cell matching technology directly translates to smoother power delivery, reduced heat generation during use, and extended cycle life—meaning your battery will maintain consistent performance across many more charging and discharging cycles than standard LiPo batteries. The reinforced ABS hard case construction protects against physical impacts, track debris and handling stress, making this battery ideal for the demanding competitive environments where crashes and collisions are simply part of the sport. The combination of high discharge rates, large capacity and durable construction makes this battery particularly suitable for brushless motor setups and high-demand electronic speed controllers (ESCs) found in modern RC cars. The 10 AWG silicone wire leads are substantial enough to handle the 344.5A maximum continuous current without significant voltage drop, ensuring that power delivery remains efficient and effective throughout your driving session. With dimensions of approximately 139mm length × 47mm width × 37mm depth and a weight of 387g, the battery strikes an excellent balance between capacity, power output and form factor, fitting comfortably into the battery compartments of most 1/10 and 1/8 scale RC vehicles. The EC5 connector, rated for high-current applications, reduces electrical resistance to an absolute minimum, eliminating connection heat loss and ensuring every amp reaches your motor with maximum efficiency. This is true racing-grade battery technology designed by engineers who understand exactly what competitive RC car racers need from their power systems.

What's in the Box

• 1 × Overlander 5300mAh 11.1V 3S 65C Hard Case Sport Track LiPo Battery in reinforced ABS protective hard case
• 1 × Pre-installed EC5 high-current connector ready for immediate connection to compatible RC models
• 1 × JST-XH balance connector lead for safe and balanced charging
• 1 × 10 AWG silicone-insulated wire leads for excellent conductivity and durability

What You Need to Complete

• LiPo Battery Charger — You will need a dedicated LiPo balance charger specifically designed for lithium polymer chemistry. Standard chargers or incorrect charging settings can cause overcharging, uneven cell balancing, overheating or serious fire hazards. Always use a charger set to LiPo mode with built-in voltage cut-off protection to charge this battery safely and maintain its health and performance.
• RC Model Compatible with 11.1V 3S Power — Ensure your RC car, buggy or truck is designed to accept 11.1V (3S) LiPo batteries. Check your model's specifications and manufacturer recommendations to confirm compatibility with this voltage and capacity. Installing a battery with incorrect voltage can damage your ESC, motor and other electronics.
• Voltage Checker (Optional but Recommended) — A handheld LiPo voltage checker allows you to monitor the charge level of each individual cell, helping you avoid over-discharging below the critical 3.0V per cell minimum threshold. This simple tool extends battery life dramatically by preventing the permanent damage that comes from over-discharging.
• LiPo Storage and Safety Bag (Optional) — For safe storage and charging, consider using a dedicated LiPo battery storage bag or charging pouch. These specially designed bags contain any potential cell leakage and provide protection in the extremely unlikely event of cell failure, adding an extra layer of safety to your battery charging and storage routine.

Frequently Asked Questions

• Is the Overlander 5300mAh 11.1V 3S 65C LiPo suitable for beginners? — Whilst this battery is technically suitable for any RC model designed to accept 3S LiPo batteries, it's important to understand that LiPo batteries require careful handling, proper charging equipment and responsible storage. Beginners should educate themselves thoroughly on LiPo battery safety, charging procedures and storage requirements before using this or any lithium polymer battery. If you're new to RC, consider starting with a pre-assembled ready-to-run RC car UK model that includes a suitable battery and charger, then graduate to aftermarket batteries like this once you've gained experience with battery care.
• What charger do I need for this 3S LiPo battery? — You absolutely must use a dedicated LiPo balance charger specifically set to LiPo mode. The charger must have a built-in voltage cut-off function to prevent overcharging beyond 4.2V per cell (12.6V for 3S). The battery features a JST-XH balance connector that should be connected to your charger's balance port during charging. Using an incorrect charger or wrong chemistry setting is dangerous and will damage the battery or create serious safety hazards. Never use regular NiMH or NiCd chargers with LiPo batteries.
• What is the maximum current this battery can safely deliver? — The Overlander 5300mAh features a continuous discharge rating of 65C, which means it can continuously deliver 344.5A of current (5.3Ah × 65C = 344.5A). For short bursts lasting a few seconds, the battery can handle up to 120C burst discharge, providing a peak current of 636A. However, only use these maximum currents if your ESC and motor are specifically rated for such high amperage. Always match the battery to your specific motor and ESC specifications.
• How long will this battery last on a single charge? — Runtime depends entirely on your RC model's motor, speed controller settings and driving style. The 5300mAh capacity provides significant energy reserves, but factors like motor KV rating, gear ratio, terrain, ambient temperature and throttle usage all affect how long a single charge lasts. Generally, expect 15-45 minutes of driving on a full charge depending on your specific setup, with high-speed racing and aggressive driving consuming the battery faster than casual cruising.
• Can I use this battery with my Traxxas or ARRMA RC car? — This battery is compatible with any 1/10 or 1/8 scale RC car, buggy or truck designed to accept 11.1V (3S) LiPo batteries. Many Traxxas and ARRMA models support 3S LiPo power. However, you must verify your specific model's compatibility in the manufacturer's manual or product specifications. Note that this battery comes pre-fitted with an EC5 connector, so your model must have an EC5-compatible connector or you'll need a suitable adapter lead.
• How should I store this battery when not in use? — Store the Overlander battery at approximately 50% charge (around 3.7V to 3.85V per cell, or 11.1V to 11.55V for 3S) in a cool, dry place away from direct sunlight, heat sources, and extreme cold. Never store a fully charged or completely discharged battery for extended periods. Check the battery's charge level every few months and top it up or discharge it back to the 50% storage level to maintain cell health. Keep the battery in a safe location away from flammable materials and out of reach of children and pets.
• What happens if I overcharge or over-discharge this battery? — Overcharging beyond 4.2V per cell (12.6V for 3S) can cause cell swelling, leakage, reduced capacity, or in extreme cases, fires and explosions. Over-discharging below 3.0V per cell causes permanent internal damage that may make the battery unable to hold a charge or create safety hazards. These are not minor concerns—they're serious risks that require your full attention. Always use a charger with voltage cut-off and stop using the battery immediately if voltage drops below 3.0V per cell.
• Why do I need a special charger for LiPo batteries? — LiPo batteries have unique chemical properties requiring specific charging protocols. A LiPo balance charger monitors and equalises the voltage across all individual cells during charging, preventing cell imbalance that reduces performance and cycle life. The charger's built-in voltage cut-off prevents dangerous overcharging. Using an incorrect charger—such as a NiMH or NiCd charger—will not balance cells properly, may overcharge the battery, and creates serious fire and explosion risks. Proper LiPo charging equipment is essential, not optional.
• What makes Fullymax cells better than standard LiPo cells? — Fullymax cells undergo precision matching during manufacturing to ensure voltage, internal resistance and weight are perfectly balanced across all cells in the battery pack. This meticulous quality control results in more even discharge characteristics, reduced heat generation, longer cycle life and more consistent performance across many charging and discharging cycles. Standard cells may have slight variations that accumulate into noticeable performance differences over time, whilst Fullymax cells maintain consistency session after session.
• Is the hard case worth the extra weight compared to soft-case batteries? — Yes, absolutely. The hard case adds minimal weight (typically only 20-30 grams) whilst providing substantial protection against impacts, track debris and the physical stresses of competitive racing or rough off-road bashing. The hard case extends battery life by protecting cells from damage, reduces the risk of punctures or leaks, and keeps the pack structurally sound through countless impacts. For serious racers and bashers, the protection outweighs the negligible weight penalty many times over.

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 5300mAh 11.1V 3S 65C Hard Case Sport Track LiPo Battery (EC5) – 3143 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.