Overview
The SPM 4000mAh 2S 7.4V Smart LiPo Battery with 50C discharge rate and IC3 connector is a premium Spektrum Smart battery engineered for surface RC applications. This is the ideal power solution for RC car UK enthusiasts running smaller brushless systems, providing a perfect balance of capacity, power delivery and compact dimensions. Whether you are piloting a ready to run RC buggy, short course truck, or stadium racer, this Smart LiPo battery integrates seamlessly with the Spektrum ecosystem, eliminating the guesswork from battery management and charging routines.
Spektrum Smart batteries represent a revolutionary approach to RC power. Built-in intelligence recognises the battery's chemistry, capacity, cell count and performance characteristics automatically, meaning when you connect it to any Spektrum Smart Charger—such as the S155, S1200 or S2100—the charger knows exactly how to charge your battery safely and correctly without any manual programming required. This intelligent automation has transformed battery charging from a technical chore into a genuinely hassle-free experience, making it perfect for bashers, racers and weekend enthusiasts alike.
With its 4000mAh capacity, 7.4V nominal voltage (2-cell configuration), and impressive 50C continuous discharge rating, this battery delivers responsive acceleration and sustained power delivery across a wide range of RC vehicles. The IC3 connector ensures compatibility with countless popular RC models already in circulation, and the included hard case provides essential protection during storage and transport, giving you peace of mind that your investment is safeguarded between sessions.
Key Features
- Smart Battery Technology — Built-in intelligence communicates with Spektrum Smart Chargers to automatically recognise battery specifications and initiate safe, correct charging without any manual programming, ensuring optimal battery health and charging efficiency every single time you charge.
- 4000mAh Capacity — This substantial capacity delivers extended runtime for surface RC vehicles, allowing you to enjoy longer driving sessions between charges whilst maintaining the compact physical profile essential for fitting into smaller vehicles and chassis designs.
- 50C Continuous Discharge Rate — The 50C rating means this battery can safely deliver 200 amps of continuous current (50C × 4Ah = 200A), providing explosive acceleration and sustained power delivery for competitive racing, high-performance bashing and demanding driving applications without thermal stress.
- 2-Cell LiPo Configuration (7.4V) — The 2-cell LiPo setup produces 7.4V nominal voltage, perfectly suited for mid-powered brushless ESC systems in the 60-150A range, offering an excellent power-to-weight-to-performance balance for surface RC cars, buggies and trucks.
- IC3 Connector — This widely recognised connector type ensures broad compatibility across the RC hobby market, meaning this battery will work with countless popular RC models and platforms already in use by UK RC enthusiasts without requiring adapters or conversions.
- Hard Case Protection — Included rigid protective hard case shields the battery from impacts, punctures and environmental damage during storage and transport, extending the service life of your battery and protecting your investment in high-quality power systems.
- 90mm Balance Lead — The JST-XH balance connector with 90mm lead length ensures convenient access for charging, cell monitoring and balancing operations, fitting comfortably into most modern RC charger designs without requiring excessive reach or awkward positioning.
- Professional Build Quality — The 12 AWG discharge lead and flat cell configuration ensure minimal internal resistance, consistent voltage delivery and reliable performance lap after lap, meeting the exacting standards demanded by competitive RC racing and serious enthusiasts.
Technical Performance
This Spektrum Smart LiPo battery represents the pinnacle of modern RC battery engineering, delivering exceptional performance through a combination of chemistry, construction and intelligent integration with Spektrum's charging ecosystem. The 7.4V nominal output from two cells in series provides the ideal voltage sweet spot for contemporary brushless ESC systems commonly found in RC car UK applications, offering sufficient headroom for acceleration whilst maintaining efficiency across the entire discharge curve. With a maximum continuous discharge current of 200 amps (derived from the 50C rating applied to the 4000mAh capacity), this battery excels in high-demand applications requiring explosive acceleration, precision cornering and sustained speed maintenance throughout extended driving sessions. The 4000mAh capacity strikes an intelligent balance between runtime duration and weight minimisation—critical factors in surface RC vehicles where every gram impacts handling characteristics and acceleration response. Construction utilises flat cell geometry optimised for tight chassis fitment, whilst the 12 AWG discharge lead and professional-grade solder connections ensure minimal voltage sag even under maximum current draw. The included JST-XH balance connector with 90mm lead length facilitates convenient cell balancing through Spektrum Smart Chargers, automatically maintaining individual cell voltage equilibrium and maximising battery lifespan. The 233-gram weight integrates well into most mid-sized RC buggies, short course trucks and stadium racers without compromising handling dynamics or requiring structural reinforcement. This battery meets the exacting engineering standards of both competitive racers demanding maximum performance and weekend bashers seeking reliable, hassle-free power delivery.
What's in the Box
- SPM 4000mAh 2S 7.4V Smart LiPo Battery with IC3 connector
- Hard protective case for storage and transport
- JST-XH balance connector with 90mm lead length
Frequently Asked Questions
- What charger do I need for this SPM 4000mAh 2S Smart LiPo battery? — This battery is specifically designed to work with any Spektrum Smart Charger, including the S155 55W Smart Charger, S1200 200W Smart Charger, and S2100 2x100W Smart Charger. The Smart technology built into this battery automatically communicates with the charger, which recognises the battery's specifications and initiates correct, safe charging without any manual programming required. Simply connect the battery to any Spektrum Smart Charger and it begins charging immediately with the optimal charge rate automatically selected.
- Is this battery suitable for beginners? — Absolutely. In fact, this Smart LiPo battery is ideal for beginners precisely because it eliminates the most confusing aspect of RC battery use—programming chargers correctly. With a standard non-Smart battery, beginners must manually enter chemistry type, cell count, capacity and desired charge rate into their charger. This SPM Smart battery handles all that automatically. Simply plug it into any Spektrum Smart Charger and charging begins immediately with the correct parameters. This removes a major barrier to entry for newcomers to the RC hobby.
- What is the standard charge current and charge rate for this battery? — The normal or standard charge current is 4 amps, representing a 1C charge rate (1 × the battery's 4000mAh capacity = 4000mA or 4A). This standard 1C charge rate is the universally recommended charging speed for LiPo batteries, providing the optimal balance between charging speed and battery lifespan. Spektrum Smart Chargers automatically apply this 4A charge rate when you connect this battery.
- What applications is this battery designed for? — This SPM 4000mAh 2S Smart LiPo is engineered specifically for surface RC applications, making it ideal for brushless RC buggies, short course trucks, stadium racers, touring cars and other ground-based RC vehicles in the mid-power category. The 7.4V output suits contemporary brushless ESC systems rated between approximately 60A and 150A, which are extremely common in UK RC car markets.
- How does the 50C discharge rating translate to real-world performance? — The 50C rating represents the maximum safe continuous discharge rate—in this case, 50 multiplied by the 4000mAh capacity equals 200 amps of continuous current. This extraordinary discharge capability means the battery can sustain maximum throttle demands without thermal stress, delivering responsive acceleration and maintaining consistent voltage throughout aggressive driving. Most RC applications draw far less than this maximum capability, ensuring the battery operates well within safe margins even during intense racing or bashing sessions.
- What makes Smart batteries different from standard LiPo batteries? — Smart batteries contain integrated circuitry that communicates battery specifications to compatible chargers, eliminating manual programming entirely. Standard LiPo batteries require you to manually enter chemistry type, cell count, capacity and desired charge rate into your charger every single time. Smart batteries broadcast this information automatically, making charging genuinely plug-and-play and removing the primary source of charging-related errors that damage batteries or create safety hazards.
- What connector type is the IC3, and what vehicles use it? — The IC3 connector is a widely standardised connector type used extensively throughout the RC hobby across countless vehicle platforms and manufacturers. IC3 connectors are found on many ready to run RC cars, buggies and trucks, making this battery compatible with a vast array of existing RC vehicles without requiring converters or adapters.
- How long will this battery last between charges during driving? — Runtime depends entirely on the specific RC vehicle, driving style and throttle usage. The 4000mAh capacity provides substantial runtime, with typical usage delivering 20-45 minutes of continuous driving before the battery requires recharging. Aggressive racing with constant maximum throttle reduces runtime, whilst gentler driving and lower throttle percentage extends it significantly.
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 SPM 4000mAh 2S 7.4V Smart LiPo Battery 50C; IC3 O-SPMX40002S50H3 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.
