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

Overview

The Overlander Sport 1800mAh 3S 11.1V 25C LiPo Battery with Deans Connector is a compact and reliable power source designed for RC enthusiasts who demand consistent performance without unnecessary bulk. Whether you're flying sport planes, practising aerobatic manoeuvres, piloting lightweight drones, or driving RC cars, this battery delivers the stable power and responsive energy output that makes every session enjoyable. The 1800mAh capacity strikes the perfect balance between runtime and weight, making it an ideal choice for pilots and drivers across the UK who want their models to perform at their best without compromising on control and handling.

Part of Overlander's trusted Sport range, this 3S LiPo battery combines precision engineering with everyday affordability. It's engineered specifically for hobbyists and enthusiasts who appreciate quality construction, reliable discharge, and the confidence that comes with using a battery built to exacting standards. The compact dimensions of just 89 x 34 x 21mm and featherweight of only 137 grams mean this battery fits perfectly into tight model spaces where weight distribution and balance are critical to performance. From weekend bashers to serious pilots, the Overlander 2995DEANS offers the dependable power you need to keep your RC models flying and running smoothly.

The 25C continuous discharge rate combined with impressive 45C burst capability ensures your model responds instantly when you need it most. Whether you're executing sharp turns in an RC car, performing 3D aerobatic manoeuvres, or pushing a lightweight racing drone to its limits, this battery provides the energy flow your model demands. Overlander's precision-matched cells and rigorous testing protocols mean you get consistent, balanced energy delivery every single time you charge up and head out for a session.

Key Features

• 1800mAh Capacity with 11.1V Power — The 1800mAh capacity provides sufficient runtime for extended flying and driving sessions whilst remaining compact and lightweight, making it perfect for RC cars, planes, helicopters and lightweight drones where keeping weight down is essential for handling and control.
• 3S Cell Configuration (11.1V) — The three-cell setup delivers more power than 2S packs, supporting faster acceleration and stronger overall performance whilst remaining widely compatible with popular RC models across the hobby. This standard voltage configuration balances power delivery with reliability and weight efficiency.
• 25C Continuous Discharge Rate with 45C Burst Capability — The 25C rating ensures stable current output for everyday RC applications, responsive throttle control and reliable acceleration, whilst the 45C burst capacity provides extra power for demanding manoeuvres when you need maximum performance for short periods.
• Maximum Constant Current of 45A and Maximum Burst Current of 81A — These high current ratings ensure the battery can handle the demands of high-performance models, delivering reliable energy flow even during the most intense flying or driving sessions without voltage sag or performance loss.
• Deans Connector (T-Plug) — The Deans connector is widely recognised across the RC community for its secure fit, low-resistance design and excellent durability. This T-Plug connector ensures reliable connections between battery and model, reducing the risk of disconnections during use and maintaining consistent power delivery throughout your session.
• Precision-Matched Cells Using Fullymax Technology — Overlander batteries use high-quality Fullymax cells that are precision-matched in internal resistance, voltage and weight to ensure balanced energy output, longer battery life, consistent performance and reduced risk of overheating during intense use.
• Ultrasonic Welding Construction — The connection between nickel and aluminium tabs is strengthened using ultrasonic welding, providing greater durability and reliability than standard soldering methods and ensuring the battery withstands the rigours of regular hobby use.
• Low Self-Discharge Design with No Memory Effect — These LiPo batteries deliver more charge cycles and extended lifespan with minimal downtime. You can recharge them whenever convenient without needing to fully discharge first, giving you maximum flexibility in how you use and maintain your battery.
• Gold-Plated Connectors for Reliability — Gold-plated connector contacts ensure reliable electrical connections and reduce oxidation over time, maintaining consistent power transfer and preventing performance degradation even after extended use and storage.
• High-Quality Silicone Leads with Multi-Strand Construction — The silicone leads are multi-strand for efficient power transfer and flexibility, allowing easy routing through your model without damage risk whilst maintaining excellent electrical conductivity.
• Protective Padding for Durability — The surrounding padding offers protection from minor bumps and knocks during transport and storage, enhancing overall durability without adding unnecessary weight to the battery pack.
• 19.98Wh Energy Rating — This watt-hour rating ensures you understand the total energy the battery can deliver, helping you choose appropriate chargers and understand expected runtime based on your model's power consumption.
• JST-XH Balance Connector — The balance connector enables proper cell balancing during charging, essential for LiPo battery health and longevity. This connector works with compatible balance chargers to ensure each cell is charged equally.
• 14AWG Wire Gauge (2.5mm) — The thick 14AWG gauge wiring ensures minimal voltage drop during high current draw, maintaining stable power delivery to your model and maximising performance during demanding manoeuvres.
• Multiple Connector Options Available — Whilst this model features the Deans connector, Overlander also offers EC3 and XT60 connector options, giving you flexibility to match your existing RC model setups and expand your battery collection.

Technical Performance

The Overlander Sport 1800mAh 3S 11.1V 25C LiPo Battery represents a carefully engineered balance between power delivery, weight efficiency and practical usability for RC enthusiasts across the UK. At just 137 grams and measuring only 89 x 34 x 21mm, this battery is exceptionally compact, making it suitable for tight-fitting RC applications where every gram matters. The 3S (three-cell) configuration provides 11.1V nominal voltage, a standard in the RC hobby that offers excellent compatibility with most modern RC cars, planes, helicopters and drones whilst delivering noticeably more power than 2S alternatives. The 1800mAh capacity is carefully calibrated to provide meaningful runtime without excessive weight — ideal for lightweight models where a heavier battery would negatively impact acceleration, handling and flight characteristics. The 25C continuous discharge rate enables the battery to reliably deliver 45 amps of current on a continuous basis, whilst the impressive 45C burst rating allows peak current delivery of 81 amps for short periods, giving your model the responsive snap needed for aggressive manoeuvres and quick acceleration bursts. Built using Fullymax cells, each battery is precision-matched by industrial-grade equipment for internal resistance, voltage and weight, ensuring that all three cells work in perfect harmony. The ultrasonic welding process used to bond the nickel and aluminium tabs creates joints stronger and more durable than traditional soldering, whilst the 14AWG multi-strand silicone leads ensure efficient power transfer with minimal voltage drop even under high current draw. Gold-plated connectors resist oxidation and maintain excellent electrical contact, and the surrounding protective padding safeguards the battery from impacts without adding meaningful weight. Whether you're practising with an RC car on a local track, flying sport planes in aerobatic disciplines, or pushing a racing drone to its limits, this battery delivers the stable, consistent power output that keeps your model performing at its peak throughout your entire session.

What's in the Box

• Overlander Sport 1800mAh 3S 11.1V 25C LiPo Battery
• JST-XH Balance Connector Lead

What You Need to Complete

• Compatible LiPo balance charger (set to 3S LiPo mode) — essential for safe, balanced charging
• RC model with 3S 11.1V compatibility and Deans connector or suitable adapter
• LiPo safety charging bag (optional but highly recommended for safe charging and storage)

Frequently Asked Questions

• Is the Overlander 1800mAh 3S LiPo Battery suitable for beginners? — Yes, absolutely. The Sport range is engineered specifically for affordability and dependable performance, making it perfect for hobbyists discovering RC for the first time. The 25C discharge rate provides stable, predictable power without aggressive characteristics that might overwhelm a new pilot or driver. However, beginners must understand how to safely charge LiPo batteries using a proper balance charger set to LiPo mode, and must follow all safety guidelines including never overcharging, over-discharging or leaving batteries unattended during charging.
• What runtime should I expect from the 1800mAh capacity? — Runtime depends entirely on your specific model's power consumption. Generally, an 1800mAh battery provides 10-25 minutes of flight or drive time depending on throttle usage and model type. Lightweight sport planes and aerial models typically achieve longer runtimes, whilst high-performance racing cars or aggressive 3D flying will see shorter sessions. Always check your model's manufacturer recommendations for expected runtime with this capacity.
• Why is 3S 11.1V better than 2S for my RC model? — A 3S pack provides noticeably more power and speed than 2S alternatives, delivering faster acceleration, stronger climb performance in aircraft, and more responsive handling in cars. However, not all models are designed to handle 3S voltage. Always verify that your motor, ESC (Electronic Speed Controller) and other electronics are rated for 11.1V before using this battery. Using an incompatible voltage can damage your model's electronics or cause poor performance.
• What does the 25C discharge rating mean? — The 25C rating tells you how much continuous current the battery can safely deliver. Multiplying 25C by the 1800mAh capacity gives 45 amps of continuous current output. This means the battery can sustain high-demand flying or driving without voltage sag or performance loss. The 45C burst rating allows temporary peaks up to 81 amps for demanding manoeuvres.
• Is the Deans connector widely compatible with UK RC models? — Yes, the Deans connector (also called a T-Plug) is one of the most popular connectors in the RC hobby and is standard on many RC cars, planes and drones. However, some models use different connectors like XT60 or EC3. Always check your model's specifications before purchasing. If you need a different connector, you can purchase an adapter or swap connectors, though adapters add slight resistance and potential voltage drop.
• How should I safely charge this LiPo battery? — Always use a dedicated LiPo balance charger set to 3S LiPo mode. Connect the battery's main power lead to the charger's main input and the JST-XH balance lead to the balance port. Never use a regular charger or set the wrong chemistry mode, as this risks overcharging, uneven cell charging and serious safety hazards including overheating or fire. A balance charger ensures each of the three cells charges to exactly the same voltage, maintaining battery health and performance.
• What is the JST-XH balance connector for? — The balance connector allows a balance charger to monitor and adjust each individual cell's voltage during charging, ensuring perfect balance between all three cells. Balanced cells deliver consistent power, perform more reliably and last significantly longer than unbalanced batteries. The balance lead has three wires plus ground, allowing the charger to manage each cell independently.
• How do I store this battery properly? — Store the 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 areas. Never store a fully charged battery or a completely drained battery for extended periods. If storing for several weeks or months, check the battery every 2-3 months and give it a quick charge or discharge back to 50% to keep the cells healthy. Always store in a fireproof LiPo safety bag for maximum protection.
• What happens if I overcharge or over-discharge this battery? — Overcharging (charging beyond 4.2V per cell) can cause cell swelling, internal damage, reduced capacity and serious safety risks including leaks or fires. Over-discharging (draining below 3.0V per cell) permanently damages the battery and makes it unsafe. Always use a proper balance charger with voltage cut-off protection and stop using your model when the battery voltage gets low. Most quality chargers automatically stop when cells reach maximum safe voltage.
• What is the weight advantage of this compact design? — At just 137 grams, this battery is exceptionally light, making it ideal for RC planes, lightweight drones and helicopters where weight directly impacts performance, climb rate and flight characteristics. In RC cars, a lighter battery helps reduce unsprung weight and improves handling response. The compact 89 x 34 x 21mm dimensions mean it fits into tight spaces and allows better weight distribution for improved balance.
• Can I use this battery in multiple models? — Yes, you can share this battery between different models as long as they all have 3S 11.1V compatibility and use Deans connectors (or you have suitable adapters). This is cost-effective for hobbyists with multiple models. However, always allow the battery to cool for at least 15-20 minutes between uses, and never operate a hot battery — let it reach room temperature before flying or driving again.
• How long will this battery last before needing replacement? — LiPo batteries typically provide 200-500 charge cycles before capacity begins to noticeably decrease, depending on how carefully you treat them. Proper charging, avoiding overcharge and over-discharge, storing at 50% charge, and allowing cool-down between sessions all extend lifespan significantly. Most hobbyists get 1-3 years of regular use from a well-maintained battery before performance degrades enough to warrant replacement.

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 – Deans Connector – 2995DEANS 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.