Traxxas Slash Battery Tray Expansion Kit Extended Hold-Down for 42mm LiPo TRX5827X

Overview

The Traxxas Slash Battery Tray Expansion Kit (TRX5827X) is an essential upgrade for UK RC enthusiasts who want to maximise the performance and runtime of their Traxxas Slash short course truck. Whether you're a seasoned RC car UK competitor or a weekend basher, this extended battery hold-down system unlocks the ability to use taller, multi-cell LiPo batteries within your vehicle's stock battery tray. This means you can now fit battery packs up to 42mm in height, a significant improvement over standard configurations that limits you to smaller capacity cells. By upgrading to this battery expansion kit, you'll experience longer running times between charges, more consistent power delivery throughout your battery's discharge cycle, and the flexibility to choose from a wider range of aftermarket LiPo options available from RC retailers across the UK.

The Traxxas Slash is one of the most popular ready to run RC short course trucks available today, and countless owners are discovering that battery limitations can restrict their enjoyment. The TRX5827X solves this problem elegantly with a thoughtfully engineered hold-down system that maintains secure battery retention even during hard bashing and intense track sessions. This upgrade is particularly valuable if you're running 3S or larger multi-cell LiPo packs, as these typically have larger physical dimensions than single-cell or smaller capacity alternatives. Installing this expanded battery hold-down gives you genuine performance benefits without compromising the structural integrity or reliability of your chassis.

Compatible with the Slash 2WD (both standard and LCG variants) and the Slash 4x4 standard configuration, this is a straightforward bolt-on upgrade that requires no modification to your chassis or body. The angled body clip design ensures proper clearance and retention, while the included foam spacer and battery post components provide cushioning and support for your valuable LiPo investment. Easy to install and simple to use, this battery tray expansion kit has earned consistently positive feedback from the RC community, with users praising its straightforward operation and effective performance enhancement.

Key Features

• Extended Battery Hold-Down Design — This upgrade expands the maximum battery height capacity to 42mm, allowing you to fit substantially larger multi-cell LiPo packs into your stock Slash battery tray compared to the standard hold-down system. This means dramatically longer runtimes and more power available for bashing.
• Angled Body Clip System — The cleverly angled body clip maintains perfect retention and clearance for your battery during aggressive driving, preventing battery movement and ensuring consistent electrical contact throughout your run.
• Foam Spacer Included — A protective foam spacer cushions your battery and absorbs vibration, protecting your expensive LiPo pack from impacts and extending its operational lifespan through effective shock absorption.
• Aluminium Battery Post — Durable aluminium construction provides reliable support and alignment for your battery configuration, offering strength whilst remaining lightweight enough not to significantly impact overall vehicle dynamics.
• Wide Model Compatibility — This expansion kit works with the Slash VXL 4x4 (in orange, red, blue and green), the Slash HD XL-5 2WD (in green, red, blue and orange), and standard or LCG Slash 2WD configurations, making it a genuinely versatile upgrade for the Slash family.
• Simple Installation — Users consistently report that this battery hold-down expands easily and intuitively, with straightforward bolt-on installation that requires no chassis modification or special tools, making it perfect for users of all experience levels.
• Reinforcement Options — Advanced users have reported success reinforcing the hold-down system with velcro through the centre slots on the chassis for additional security during particularly hard landings, giving you flexibility to customise your setup.

Technical Performance

The Traxxas Slash Battery Tray Expansion Kit represents proper engineering for RC car UK users who want to extract maximum performance from their short course trucks. The system is constructed from quality materials including aluminium components for the battery post and durable plastic elements for the body clip and foam spacer arrangement. The 42mm height allowance opens up a whole new world of battery options—most modern 3S and larger capacity LiPo packs sit comfortably within this envelope, whereas stock Slash configurations restrict you to smaller, lower-capacity cells. The extended design maintains the same reliable retention characteristics as standard hold-downs, meaning you won't experience battery movement during jumps, hard cornering, or aggressive bashing sessions. Multiple users report that the system performs well across different driving conditions, from gentle recreational bashing to competitive track use. The aluminium post construction provides excellent durability, though some experienced bashers have noted that extreme impacts can occasionally bend the extended screw post—a minor trade-off for the significant performance gains in battery capacity. The foam spacer design effectively cushions your battery against vibration and minor impacts, extending the operational life of your LiPo investment. Overall build quality reflects Traxxas's reputation for practical, field-tested designs that prioritise real-world usability over theoretical perfection.

What's in the Box

• Extended battery hold-down retainer unit
• Angled body clip
• Foam spacer
• Aluminium battery post

Frequently Asked Questions

• Will this battery expansion kit fit my Slash 2WD or Slash 4x4? — Yes, the TRX5827X is fully compatible with Slash 2WD models in both standard and LCG (Low Centre of Gravity) configurations, as well as the Slash 4x4 in standard setup. It will not fit Slash 4x4 LCG versions. Check your specific model variant before ordering to ensure compatibility.
• What is the maximum battery height this system accommodates? — The extended battery hold-down allows LiPo packs of up to 42mm in height to fit securely in the stock battery tray. This is a significant increase over standard hold-downs and opens up many additional battery options from RC retailers across the UK.
• Is this suitable for beginners? — Absolutely. The TRX5827X is straightforward to install with basic tools and represents an excellent upgrade for beginners looking to extend their Slash's runtime. Multiple users report that installation is easy and intuitive, with no complex modifications required.
• How much longer will my Slash run with a bigger battery? — Runtime extension depends on your chosen battery capacity and your driving style. A larger 42mm-tall LiPo pack will typically provide significantly more capacity than stock options, potentially offering 50-100% longer running times depending on the specific pack you select.
• Can I use this with velcro reinforcement for extra security? — Yes, experienced users have reported success adding velcro strips through the centre slots on the chassis for additional retention during hard impacts, making this a flexible system adaptable to your specific needs.
• What battery types are compatible? — The system is designed for LiPo batteries up to 42mm in height, which encompasses most modern multi-cell LiPo packs in 3S and larger configurations. Always verify your specific battery dimensions before installation.
• Is the aluminium post durable enough for hard bashing? — The aluminium battery post provides excellent strength and durability for normal and aggressive driving. Some advanced bashers have experienced bending during extreme impacts, though this is relatively rare. Velcro reinforcement can provide additional security if needed.

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 Hold down, battery / hold down retainer / battery post / foam spacer / angled Body clip (allows for installation of taller, multi-cell batteries) TRX5827X 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.