Traxxas NiMH 8.4V 4200mAh 7-Cell RC Battery Pack Flat TRX2950X

Overview

The Traxxas NiMH 8.4V 4200mAh 7-Cell Power Cell Battery (Flat, model TRX2950X) is a premium rechargeable battery pack designed for serious RC enthusiasts who demand longer run times and consistent performance from their Traxxas models. Whether you're piloting an RC car in the UK or tackling challenging terrain with your ready to run RC vehicle, this 4000-series battery delivers the extended playtime and sustained voltage that separates casual bashers from dedicated RC hobbyists. The flat profile design makes it ideal for models requiring a streamlined battery configuration, whilst the advanced NiMH chemistry provides reliable, predictable power delivery throughout your driving sessions.

This battery represents a significant step up from earlier 3000-series packs, offering 25% greater capacity for noticeably longer runtime before requiring a recharge. The Traxxas iD battery system takes the guesswork out of battery management, automatically recognising your battery and optimising charge parameters for safety and longevity. Built with low-resistance cells and premium construction quality, this is the battery choice for RC enthusiasts who refuse to compromise on performance, reliability or value.

If you're serious about RC car racing or recreational driving in the UK, investing in multiple 4200mAh batteries ensures you can keep your Traxxas model running all day long without extended downtime between charges. The 7-cell configuration delivers the perfect 8.4V output for most modern Traxxas electric vehicles, making this one of the most versatile battery options in the Traxxas catalogue.

Key Features

• 4200mAh High Capacity — With 4200 milliamp-hours of energy storage, this battery delivers 25% greater capacity than Traxxas 3000-series batteries, meaning significantly longer runtime on a single charge so you can enjoy extended driving sessions without frequent interruptions.
• 8.4 Volt 7-Cell NiMH Chemistry — The seven-cell configuration provides a perfect balance of voltage output and current delivery characteristics, offering consistent power throughout the discharge cycle whilst remaining compatible with a wide range of Traxxas electric RC models.
• Low-Resistance Cell Design — Premium low-resistance cells minimise voltage sag and internal heat generation, ensuring your RC car maintains strong acceleration and top-end performance even when the battery reaches lower charge levels, delivering more predictable handling and responsiveness.
• Flexible Silicone-Jacketed 12-Gauge Wire — The heavy-duty wiring uses flexible silicone insulation rated for high current flow, providing superior durability and heat resistance compared to standard plastic-jacketed alternatives, whilst the 12-gauge thickness ensures minimal voltage drop between battery and speed controller.
• Heavy-Duty Welded Tabs — Traxxas engineers have eliminated common failure points by using welded (rather than soldered) connection tabs, creating extremely robust battery terminals that withstand the vibration and mechanical stress of serious RC driving without developing poor connections.
• Traxxas iD Battery System — This exclusive smart battery technology automatically identifies your battery when connected to compatible Traxxas chargers, automatically optimising charge voltage, current profile and termination logic for maximum battery lifespan and safety, eliminating manual configuration errors.
• Flat Profile Design — The TRX2950X features a flat form factor (159mm long × 48mm wide × 26mm tall) that fits perfectly into the battery compartments of modern Traxxas crawlers and other vehicles designed for flat batteries, maximising internal space efficiency.
• Premium Build Quality — Every component is engineered to Traxxas' exacting standards, from the quality of the individual NiMH cells to the welding of the tab connectors, ensuring this battery will provide years of reliable service across countless charging cycles.

Technical Performance

The Traxxas 4200mAh 8.4V NiMH battery is engineered with meticulous attention to real-world RC performance demands. The seven-cell NiMH configuration (each cell contributing 1.2 volts) totals 8.4 volts, perfectly matching the voltage specification of Traxxas electric speed controllers and motor systems. The 4200 milliamp-hour capacity ensures extended runtime compared to earlier-generation batteries, translating to more track time or trail time before recharging becomes necessary. The low-resistance cell design is critical to performance: it minimises the voltage sag that occurs under high current draw, maintaining stronger acceleration response and more consistent top-end speed throughout the entire discharge cycle. This matters enormously for competitive RC racing and serious off-road driving where consistent handling characteristics are essential.

Construction quality is paramount in this battery's design. The flexible silicone-jacketed 12-gauge wire can safely handle the high current flows demanded by brushless motors without overheating, whilst the heavy-duty welded tabs (rather than traditional solder joints) create vastly more reliable electrical connections that resist the constant vibration experienced in RC vehicles. Traxxas' exclusive iD battery system provides intelligent management, automatically detecting battery identification when plugged into compatible chargers and adjusting the charge profile accordingly. This proprietary smart system protects your investment by preventing overcharging, optimising charge current for battery chemistry safety, and providing confidence that every charge is being applied correctly. For RC enthusiasts in the UK who demand maximum reliability and performance from their ready to run RC cars and crawlers, this battery delivers engineering excellence at its finest.

What's in the Box

• Traxxas NiMH 8.4V 4200mAh 7-Cell Power Cell Battery (Flat profile, model TRX2950X)
• Traxxas iD Battery Connector (factory installed)

Compatibility

The TRX2950X is compatible with Traxxas 1/10 TRX-4 Defender 4WD RTR models (available in Green, Sand, Red and Silver colour schemes) and other Traxxas models featuring Traxxas iD connectors and 8.4V battery compatibility. Always verify voltage and connector type with your specific vehicle before purchase. This battery requires a Traxxas iD-compatible charger for optimal performance and safety (charger sold separately).

What You Need to Complete

• Traxxas iD-Compatible Battery Charger (such as the Traxxas iD Charger or EZ-Peak Plus iD Charger) — required for recharging
• Traxxas RTR Vehicle with iD Battery Connector (such as the TRX-4 Defender 4WD RTR)

Frequently Asked Questions

• What is the difference between the Traxxas 4000-series and 3000-series NiMH batteries? — The 4000-series batteries, like this TRX2950X model, deliver 25% greater capacity than the older 3000-series packs. This means significantly longer runtime before needing to recharge, making them ideal for serious RC enthusiasts who want more continuous driving time. The extra capacity translates directly to more track time or trail time per charge.
• Is this NiMH battery suitable for beginners to RC cars in the UK? — Yes, this battery is excellent for beginners because the Traxxas iD system removes the complexity of manual charger configuration. Simply plug it into an iD-compatible charger and it automatically recognises the battery and applies the correct charge profile. The flat profile design also makes installation straightforward in compatible vehicles. However, you will need to purchase a compatible iD charger separately.
• How long does this battery take to charge? — Charging time depends on which charger you use and the charge current setting. The source material does not specify an exact charge time, but modern Traxxas iD chargers can recharge a 4200mAh battery in approximately 1-2 hours depending on charger type and settings. Consult your specific charger's documentation for precise timing.
• What is the voltage and capacity of this battery? — This battery delivers 8.4 volts (from seven 1.2-volt NiMH cells) and 4200 milliamp-hours (4.2 Ah) of capacity. The 8.4V output is standard for most modern Traxxas electric RC vehicles, and the 4200mAh capacity is considerably higher than earlier-generation 3000-series batteries.
• Will this battery fit my Traxxas RC car? — The TRX2950X features a flat profile measuring 159mm long × 48mm wide × 26mm tall, which is specifically designed for Traxxas models with flat battery compartments, including the TRX-4 Defender 4WD RTR in all colour variants. Always verify that your vehicle is compatible with 8.4V batteries and Traxxas iD connectors before purchasing. Other Traxxas models may require different battery configurations.
• What does the Traxxas iD system do? — The iD battery system is Traxxas' smart battery technology that automatically identifies your battery when connected to a compatible iD charger. It automatically optimises charge voltage, charge current profile, and charging termination logic based on the specific battery's chemistry and capacity. This provides maximum safety and battery lifespan whilst eliminating user error from manual charger configuration.
• Is the 7-cell configuration important? — Yes, the seven-cell NiMH configuration is important because it delivers the correct 8.4-volt output for Traxxas electric speed controllers and motor systems. This voltage is critical for proper motor performance, ESC operation, and servo function. Using the wrong voltage battery can damage your vehicle's electronics or provide inadequate performance.
• What battery charger do I need? — You must use a Traxxas iD-compatible charger to take full advantage of the iD system's automatic configuration. Suitable chargers include the Traxxas iD Charger or the Traxxas EZ-Peak Plus iD Charger. These chargers automatically detect your battery and apply the correct charge profile without manual configuration. The charger is sold separately and not included in the box.
• How many charge cycles can I expect from this battery? — NiMH batteries typically support hundreds of charge cycles (often 300-500+ depending on usage and care), far exceeding single-use alkaline batteries. Proper charging practice using the Traxxas iD system helps maximise cycle lifespan. Avoid completely discharging the battery before each charge and store in a cool location when not in use.
• Why does this battery cost more than standard NiMH batteries? — The premium price reflects Traxxas' engineering: low-resistance cell chemistry for better performance, flexible silicone-jacketed 12-gauge wire for superior current handling, heavy-duty welded (not soldered) connection tabs for maximum reliability, and the proprietary iD system that provides intelligent charging and safety management. You're investing in reliability, performance and longevity.

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, Flat TRX2950X 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.