Traxxas LiPo 3S 6400mAh 11.1V 25C iD Power Cell Battery TRX2857X

Overview

The Traxxas LiPo 3S 6400mAh 11.1V 25C iD Power Cell Battery TRX2857X is a premium lithium polymer battery pack engineered specifically for Traxxas RC models. This is Traxxas Certified LiPo power — the most speed and run time available for your electric RC car or truck. If you're looking to maximise the performance of your Traxxas model, whether you own a Slash, Slash 4x4, or compatible X-Maxx, this battery is designed to unlock the full potential your vehicle was built to achieve. The Power Cell series represents Traxxas's commitment to providing simple, reliable power solutions that put the guesswork out of going fast.

Whether you're a seasoned RC competitor, a weekend basher exploring the hobby, or discovering RC cars for the first time, this battery delivers the punch and on-demand power you need. Traxxas doesn't just give you a battery — they give you engineered performance. Only Traxxas gives you more of what you want most: simple installation, an excellent price point, and the most speed and run time available. This is the ideal upgrade or replacement battery for anyone serious about getting the best from their Traxxas RC vehicle in the UK.

Compatible with a comprehensive range of Traxxas models including the Slash VXL, Slash 4x4 VXL, Slash Extreme HD VXL, and X-Maxx Belted 4WD Brushless, this battery is built to deliver consistent, reliable performance across multiple platform types. The Traxxas iD connector system ensures safe, foolproof compatibility and charging — no more guessing whether you've got the right battery for your model.

Key Features

• Traxxas Certified LiPo Battery — This battery is engineered and certified by Traxxas to deliver maximum performance and safety for your specific RC model, ensuring compatibility and reliability that aftermarket alternatives cannot match.
• 6400mAh Capacity — With 6400 milliamps of charge capacity, this battery provides extended run time between charges, allowing you to enjoy longer sessions without frequent recharging interruptions.
• 11.1V 3S (3-Cell) Configuration — The three-cell LiPo configuration delivers 11.1 volts nominal voltage, which is optimised for Traxxas VXL brushless systems and equivalent electric powertrains to maximise speed and acceleration.
• 25C Discharge Rate — The 25C continuous discharge rating means this battery can deliver sustained high current output, providing the power punch needed for aggressive acceleration and high-speed performance on track, trail, or carpet.
• Traxxas iD Connector Technology — The integrated iD connector system automatically communicates battery information to compatible Traxxas chargers, providing intelligent charging that optimises safety and battery lifespan whilst preventing misuse.
• Engineered for Traxxas Models — This battery is designed specifically to fit Traxxas models and maximise their full performance potential, with precise dimensions engineered to fit snugly in the battery compartment.
• Simple Installation — The Traxxas iD system and standardised connector make installation straightforward and foolproof, allowing you to swap batteries and get on the track without confusion or compatibility issues.
• Compact Stick Battery Design — The stick battery form factor is engineered to balance weight distribution in your RC vehicle whilst maintaining enough capacity for extended run times, optimising handling and performance characteristics.

Technical Performance

The Traxxas LiPo 3S 6400mAh 11.1V 25C iD Power Cell Battery TRX2857X is engineered at the highest level of specification to deliver maximum performance for Traxxas electric RC models. The 6400mAh capacity provides substantial energy reserves for extended run times, whilst the 25C discharge rate ensures the battery can deliver the continuous high current required by brushless ESCs and motors. The 11.1V nominal voltage (3S LiPo) is the standard for Traxxas VXL brushless systems, including the Slash VXL 4x4, Slash 2WD VXL variants, Slash Extreme HD VXL, and the powerful X-Maxx 4WD monster trucks. The battery's dimensions of 132mm length, 45mm width, and 42mm height are precisely engineered to fit Traxxas battery compartments without modification. Measuring 130-139mm in actual length, 40-49mm in height, and 40-49mm in width, this stick battery maintains the compact form factor Traxxas owners expect. The Traxxas iD connector ensures intelligent communication between the battery and charger, preventing overcharging and damage whilst optimising charge cycles for maximum battery lifespan. The battery type is Lithium Polymer (LiPo), which offers superior energy density compared to older NiMH chemistry, translating to lighter weight for the same capacity and better power delivery characteristics. Only use this battery with chargers specifically designed for LiPo batteries, as improper charging can damage the battery or create safety hazards. Store and charge the battery in a fireproof container or pouch, never inside your model, and monitor charging at all times. Never leave the battery unattended whilst charging. This is a power pack designed for users aged 14 and above who understand safe LiPo handling protocols.

What's in the Box

• Traxxas LiPo 3S 6400mAh 11.1V 25C iD Power Cell Battery (single pack)

What You Need to Complete

• Traxxas iD-compatible charger (separate purchase — Traxxas recommends their own iD charging solutions)
• Fireproof LiPo charging pouch or container for safe storage and charging
• Compatible Traxxas RC vehicle such as Slash VXL, Slash 4x4 VXL, Slash Extreme HD VXL, or X-Maxx

Frequently Asked Questions

• Is the Traxxas 6400mAh LiPo 3S battery compatible with my Traxxas Slash or Slash 4x4? — Yes, this battery is specifically engineered for Traxxas Slash and Slash 4x4 models equipped with the VXL brushless system. The Traxxas iD connector ensures automatic compatibility recognition with compatible Traxxas chargers. Check your vehicle's documentation to confirm it is a VXL (3S compatible) model, as XL-5 models require different battery specifications.
• What is the difference between the 25C discharge rate and higher C ratings I see on other RC batteries? — The 25C rating means this battery can continuously discharge at 25 times its capacity in amps (6.4Ah × 25 = 160A maximum continuous discharge). This is more than sufficient for most Traxxas brushless applications. Higher C-rated batteries allow peak discharges but cost more; the 25C rating provides the best balance of performance and value for Traxxas owners.
• How long will the battery run on a single charge? — Run time depends on your driving style, terrain, and vehicle setup. Aggressive acceleration and high-speed driving will reduce run time compared to smooth, controlled driving. The 6400mAh capacity is considered high capacity for 3S systems, typically providing 15-25 minutes of practical run time depending on usage patterns.
• Is this battery suitable for beginners in the UK RC hobby? — This is a quality battery from a trusted manufacturer, but LiPo battery handling requires responsibility and knowledge. Beginners should understand safe charging practices (use only LiPo-compatible chargers), safe storage (fireproof container), and never leave a charging battery unattended. The battery is recommended for users aged 14 and above. If you are new to LiPo batteries, take time to learn proper handling before use.
• What charger should I use with this Traxxas iD battery? — You must use a charger specifically designed for LiPo batteries. Traxxas manufactures several iD-compatible chargers that automatically recognise this battery's specifications and optimise the charging process. Standard NiMH chargers will not work and may damage the battery. Your local RC Model Shop team can recommend the best charger option for your needs.
• How does the Traxxas iD connector system work and why is it better? — The iD connector contains smart circuitry that communicates battery capacity, cell count, and condition to compatible Traxxas chargers. This eliminates the risk of charging the wrong battery type, prevents overcharging, and allows the charger to optimise charging profiles for maximum battery lifespan and safety. It's a foolproof system that takes the guesswork out of battery management.
• Can I use this battery in models other than Traxxas? — Whilst the physical connector might fit some other RC brands, Traxxas batteries are specifically engineered for Traxxas models and their electrical systems. Using Traxxas batteries in non-Traxxas vehicles or vice versa may void warranties or damage equipment. For best results, always match batteries to their intended vehicle platform.
• What safety precautions should I follow with this LiPo battery? — Lithium Polymer batteries require careful handling. Always charge in a fireproof LiPo safety pouch or container. Never charge unattended. Never charge inside your RC model. Use only LiPo-compatible chargers. Store in a cool, dry place away from flammable materials. Never allow the battery to be crushed, punctured, or immersed in water. Swollen or damaged batteries should not be used. Follow all safety instructions in the battery documentation and charger manual.
• What is the shipping weight and dimensions of this battery? — The battery weighs 0.54kg (1.18lbs) and measures 132mm in length with a 45mm width and 42mm height, making it light enough to carry spares to the track whilst substantial enough to provide serious capacity for extended run times.

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 LiPo 3S 6400mAh 11.1V 25C iD Power Cell Battery TRX2857X 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.