Overview
The Traxxas NiMH 8.4V 4200mAh 7-Cell Power Cell Battery in hump configuration is a premium energy solution designed for serious RC enthusiasts across the United Kingdom. Whether you're running RC car UK models, exploring ready to run RC vehicles, or looking to upgrade your existing Traxxas setup, this 4000-series battery pack delivers the performance and reliability that Traxxas is renowned for. The hump design allows for optimal weight distribution in vehicles specifically engineered for this battery profile, ensuring balanced handling and consistent performance throughout extended driving sessions.
This battery represents a significant step up from earlier 3000-series options, providing 25% greater capacity for longer run times and higher sustained voltage under load. For RC enthusiasts in the UK seeking dependable power that maintains consistent performance even under demanding conditions, this battery is an excellent choice. The combination of advanced cell technology, robust construction, and Traxxas' exclusive iD battery system creates a comprehensive package that takes the guesswork out of battery management and charging.
Built for durability and engineered for performance, the Traxxas Power Cell range has earned its reputation amongst competitive racers, weekend bashers, and recreational drivers alike. The 4200mAh capacity ensures you can enjoy extended play sessions without frequent battery swaps, whilst the proven Traxxas build quality means this battery will provide years of reliable service.
Key Features
- 4200mAh Capacity — The substantial 4200mAh capacity provides 25% greater power capacity compared to earlier 3000-series battery packs, translating directly to longer run times and the ability to sustain high performance throughout your entire driving session without voltage sag affecting handling or acceleration.
- 8.4V Nominal Voltage — The 8.4V specification (7 cells at 1.2V per cell) delivers the optimal power output designed specifically for compatible Traxxas models, ensuring proper motor performance, ESC compatibility, and overall vehicle behaviour as engineered by the manufacturer.
- Low-Resistance Cells — Traxxas engineers cells with minimised internal resistance, which means more usable power reaches your motor rather than being wasted as heat during discharge, resulting in better acceleration, higher sustained voltage under load, and improved overall runtime performance.
- Flexible Silicone-Jacketed 12-Gauge Wire — The use of premium 12-gauge silicone-jacketed wire provides superior electrical conductivity whilst remaining flexible for easy installation and repositioning within your RC vehicle's battery bay, reducing voltage drop and improving power delivery consistency.
- Heavy-Duty Welded Tabs — Rather than relying on solder connections that can degrade over time, Traxxas employs heavy-duty welded tabs that create permanent, corrosion-resistant connections between cells, ensuring reliability and consistent performance throughout the battery's service life.
- Traxxas iD Battery System — This exclusive intelligent battery management system automatically recognises compatible chargers and batteries, enabling optimised charging profiles, battery diagnostics, and safety features that protect your investment whilst delivering faster, safer charging experiences.
- Hump Configuration — The hump-shaped profile is specifically engineered to fit within the chassis of compatible Traxxas vehicles, allowing for optimal centre of gravity and weight distribution that enhances handling characteristics and driving dynamics.
- NiMH Chemistry — Nickel-metal hydride chemistry offers robust reliability, excellent cycle life, and proven performance that has made NiMH batteries the standard choice for countless RC enthusiasts worldwide, with no memory effect and forgiving charging characteristics.
Technical Performance
The Traxxas 4000-series Power Cell battery represents the pinnacle of NiMH battery engineering, combining proven chemistry with advanced manufacturing techniques to deliver uncompromising performance. The 4200mAh capacity at 8.4V nominal voltage is achieved through seven individual cells, each engineered with low-resistance technology to ensure minimal voltage drop during discharge. The flexible, silicone-jacketed 12-gauge wiring provides superior electrical conductivity—a critical factor that directly impacts acceleration, sustained voltage stability under load, and overall runtime performance in demanding RC applications. These internal connections are permanently welded rather than soldered, creating robust connections that maintain integrity through countless charge-discharge cycles without degradation. The dimensions of 139mm length, 42mm height, and 48mm width are precisely calculated to integrate seamlessly into compatible Traxxas chassis designs, ensuring proper weight distribution and optimal centre of gravity. The integration of Traxxas' exclusive iD battery system means your battery can communicate with compatible chargers, delivering intelligent charging profiles that maximise lifespan whilst minimising charge time. Whether you're piloting your RC model through suburban streets, tackling off-road terrain, or participating in competitive events across the UK, this battery's engineering ensures consistent, reliable performance that won't let you down.
What's in the Box
- Traxxas 4200mAh 8.4V NiMH Battery Pack (TRX2951X)
- Traxxas iD Connector pre-installed
Frequently Asked Questions
- What is the difference between the 4000-series and 3000-series Traxxas batteries? — The primary advantage of the 4000-series Power Cell is the 25% greater capacity compared to 3000-series packs. This translates to longer run times and higher sustained voltage under load, meaning your RC vehicle will maintain consistent performance and acceleration throughout extended driving sessions rather than experiencing voltage sag that can affect handling and speed as the battery depletes.
- Is this battery compatible with my Traxxas RC car UK model? — The 8.4V, hump-configuration design makes this battery compatible with numerous Traxxas models engineered to accept this battery profile. We recommend checking your vehicle's manual or contacting our team to confirm compatibility with your specific Traxxas model before purchase.
- What charger do I need for this battery? — The Traxxas iD battery system works seamlessly with any Traxxas iD-compatible charger, which automatically recognises this battery and delivers the optimised charging profile. The intelligent system eliminates guesswork and ensures you're always charging safely and efficiently. If you don't already own a compatible charger, we can recommend suitable options.
- How long will this battery last during a driving session? — The 4200mAh capacity provides significantly extended runtime compared to smaller capacity packs, though actual duration depends on factors including driving style, vehicle weight, terrain, motor efficiency, and ambient temperature. Most users report 20-45 minutes of continuous driving per charge, with multiple batteries allowing for all-day RC enjoyment.
- What makes Traxxas iD technology beneficial? — The iD system features automatic battery and charger recognition, which enables safety protocols, optimised charging profiles, and diagnostic information. This intelligent approach protects your investment, reduces charging time, and ensures you're always getting the most from your battery whilst minimising the risk of damage from incorrect charging parameters.
- Is NiMH still a good choice for RC cars in 2024? — Absolutely. Whilst lithium-polymer batteries have become popular in certain segments, NiMH technology remains excellent for ready to run RC models and recreational driving. NiMH batteries offer forgiving charging characteristics, proven reliability, excellent cycle life, no memory effect, and outstanding value. They're ideal for bashers, weekend drivers, and anyone prioritising dependable performance and ease of use.
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 Traxxas NiMH 8.4V 4200mAh 7-Cell Power Cell Battery, Hump TRX2951X 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.
- Model Number: TRX2951X
- Brand: Traxxas
- Battery Type: NiMH (Nickel-Metal Hydride)
- Battery Configuration: 7-Cell
- Capacity: 4200mAh
- Voltage: 8.4V Nominal
- Battery Form Factor: Hump
- Battery Connector: Traxxas iD Connector
- Cell Technology: Low-resistance cells
- Internal Wiring: Flexible silicone-jacketed 12-gauge wire
- Connection Type: Heavy-duty welded tabs
- Battery Management System: Traxxas exclusive iD battery system
- Length: 139mm
- Height: 42mm
- Width: 48mm
- Capacity Category: 4000-4999mAh
- Battery Application: Power Packs
- Series Classification: 4000-series Power Cell
- Advantages vs 3000-series: 25% greater capacity, longer run times, higher sustained voltage under load
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
- As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
