Traxxas Battery Expansion Kit for Rustler Bandit Stampede VXL TRX3725X

Overview

The Traxxas Battery Expansion Kit is an essential upgrade for owners of high-performance Velineon brushless RC vehicles in the UK who want to unlock the true potential of their models. Whether you're running a Rustler VXL, Bandit VXL, or Stampede VXL, this cleverly engineered kit allows you to install taller, multi-cell LiPo battery packs that deliver superior runtime and power output. If you've been frustrated by space constraints in your standard battery tray, this expansion kit removes that limitation entirely, making it an affordable and straightforward solution for upgrading your brushless RC car UK setup.

This is not just a hobby upgrade—it's a performance-enhancing modification that serious RC enthusiasts recommend. The kit includes all the hardware necessary to raise both your electronic speed control (ESC) mount and battery posts, providing an additional 13mm of clearance inside the battery compartment. This extra space is exactly what you need to safely accommodate larger format battery packs without forcing components or risking damage to your vehicle. Installation is straightforward enough that most owners can complete the modification in under an hour with basic tools, making it perfect for weekend bashers and competitive racers alike.

For anyone serious about maximising the performance of their ready to run RC vehicle, the Battery Expansion Kit from Traxxas represents smart thinking. More battery capacity means longer run times between charges, and the raised ESC mount ensures proper cooling and clearance for all your electrical components. This is why experienced RC enthusiasts across the UK consider this kit a must-have accessory for their Velineon-powered models.

Key Features

• 13mm Height Clearance Increase — The kit raises both the electronic speed control mount and battery posts by exactly 13mm, which provides sufficient clearance for taller LiPo battery packs that would otherwise not fit in the standard battery tray. This engineering precision means you can finally use the larger capacity batteries your brushless motor demands without compromise.
• Easy Installation — Designed as a bolt-on modification, the expansion kit allows VXL owners to unleash the high-speed potential of the Velineon Brushless Power System without requiring professional help or extensive mechanical knowledge. Most installations take under an hour and require only standard hand tools.
• Dual Battery Post Heights — The front battery posts include two mounting locations for both standard and raised heights, giving you flexibility in battery selection and the ability to adjust your setup as your needs evolve or if you choose to upgrade battery sizes later.
• Complete Hardware Package — The kit includes new posts, latches, and all necessary hardware to complete the modification properly, meaning you don't need to hunt down additional components or substitute parts from other kits.
• Factory-Look Aesthetic — The expansion hardware maintains a clean factory appearance that complements the professional look of Velineon-powered VXL models, so your RC car doesn't look haphazardly modified with jury-rigged components.
• Enhanced ESC Cooling — By raising the electronic speed control mount away from the battery tray floor, the kit improves air circulation around your ESC during high-performance runs, which extends component lifespan and maintains consistent performance during extended sessions.

Technical Performance

The Traxxas Battery Expansion Kit is engineered with precision manufacturing to ensure compatibility across multiple Velineon VXL platforms including the Rustler VXL, Bandit VXL, and Stampede VXL models. The 13mm vertical adjustment is calculated specifically to accommodate the height of taller LiPo battery packs—typically 3S configurations and multi-cell arrangements—while maintaining proper fitment within the vehicle's chassis and body. The raised ESC mount serves a dual purpose: it prevents thermal stress on your electronic components during demanding high-speed runs by improving ventilation, and it ensures that your battery connectors and wiring maintain proper clearance from moving suspension components. The hardware consists of robust posts and latches manufactured to Traxxas's quality standards, with multiple mounting points on the front battery posts allowing you to fine-tune your setup. Users consistently report that installation is straightforward, though pre-existing rust on original fasteners may require penetrating oil or careful removal. The kit's design maintains the integrity of the battery tray system whilst providing the clearance necessary for serious performance upgrades. This is genuine engineering that respects the original design of your RC vehicle whilst enabling it to reach its full potential with upgraded battery technology.

What's in the Box

• New battery posts (raised height)
• Battery latches
• Complete hardware set (screws and fasteners)

Frequently Asked Questions

• Which Traxxas VXL models is this battery expansion kit compatible with? — The kit is designed for Velineon brushless-powered models including the Rustler VXL, Bandit VXL, and Stampede VXL. The Stampede VXL requires an additional two-piece receiver and battery hold down kit (model 3627X) to complete the installation properly, so check your model before ordering if you're running a Stampede.
• How much additional clearance does this kit provide? — The battery expansion kit raises both the electronic speed control mount and battery posts by exactly 13mm, which provides sufficient space for most taller format multi-cell LiPo battery packs that would not fit in the standard battery tray.
• Is this kit easy to install for beginners? — Yes, installation is straightforward enough that most RC enthusiasts can complete it in under an hour using standard hand tools. The kit includes all necessary hardware, and most users report that the modification is one of the easier upgrades you can make to your RC car. However, if your original fasteners are seized or rusted, you may need penetrating oil to remove them safely.
• What battery sizes can I use after installing this kit? — The 13mm clearance increase allows you to safely use taller multi-cell LiPo battery packs, particularly 3S configurations and other larger format batteries that would not fit in the original battery compartment. Your specific options will depend on your individual vehicle model and chassis geometry.
• Will this kit affect the appearance of my RC car? — No, the expansion kit maintains a clean factory look that complements the professional appearance of your Velineon-powered VXL model, so your RC car will not look like it has aftermarket modifications that detract from its aesthetics.
• Does this kit improve cooling of my electronic speed control? — Yes, by raising the ESC mount, the kit improves air circulation around your electronic components during high-performance runs, which helps with thermal management and extends the lifespan of your expensive electrical components.
• Are there any compatibility issues I should know about? — One user reported that some cooling fans may sit too close to the vehicle body after installation, potentially causing clearance issues if you plan to use additional cooling accessories. It's worth checking your specific combination of upgrades before purchase.

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 Battery Expansion Kit (allows for installation of taller multi-cell battery packs) TRX3725X 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.