SPM Firma 85A Black Edition Brushless Smart ESC V2, 2S-3S P-SPMXSE2085

Overview

The SPM Firma 85A Black Edition Brushless Smart ESC V2 is a professional-grade electronic speed control designed for serious RC enthusiasts running 2S-3S LiPo batteries. Built by Spektrum, one of the industry's most recognised names in RC electronics, this brushless ESC combines cutting-edge technology with exceptional reliability, making it an ideal choice for 1/10th scale surface applications including 2WD and 4WD setups. Whether you're a seasoned competitor looking to upgrade your brushless RC car UK setup or a dedicated hobbyist seeking premium performance electronics, the Firma 85A Black Edition delivers the power, intelligence and telemetry feedback you need to dominate on the track or trail.

What sets the Firma 85A apart from standard ESCs is its integration into the complete Spektrum Smart ecosystem. Like every component in the Spektrum Smart family, this brushless ESC combines plug-and-play simplicity with the ability to communicate with other Smart electronics, creating the best-performing RC system for your vehicle. The Firma Smart ESC does much more than simply regulate power to your motor. It functions like a virtual engineer inside your model, providing a direct path to the vital operating data you need to reach peak performance and maximise your confidence in your setup. This isn't just an electronic speed control—it's a comprehensive power management and data acquisition system that transforms how you interact with your RC vehicle.

The Black Edition aesthetic combines professional styling with serious functionality. With its compact design, waterproof construction and advanced 32-bit processing power, the Firma 85A Black Edition V2 is ready to install in almost any 1/10th scale surface vehicle without requiring soldering. Whether you're upgrading an existing brushless RC car or building a new ready to run RC setup, this ESC provides the reliability, features and real-time telemetry that serious RC hobbyists demand.

Key Features

• Smart All-in-One Telemetry — The Firma 85A provides a single-wire telemetry solution that gathers vital operating data including RPM, temperature, battery voltage, cell balance and capacity, sending all this information to your compatible Spektrum transmitter in real-time. This means you can monitor your vehicle's performance as it happens, adjust settings on the go to boost performance, and make data-driven decisions about tuning and maintenance, rather than waiting until after a run to review telemetry data stored in a separate module.
• Fast 32-Bit ARM M4 Processor — The Firma 85A is powered by a sophisticated 32-bit ARM M4 processor that delivers lightning-fast response times and incredibly smooth power delivery. This high-performance computing platform handles complex algorithms and real-time data processing, ensuring your brushless motor receives perfectly optimised signals for maximum efficiency and responsiveness, whether you're accelerating hard on the track or executing precision manoeuvres in tight competition.
• Waterproof Construction — Built with a rugged plastic case and aluminium heat sink, the Firma 85A is fully waterproof, making it suitable for use in wet conditions, muddy terrain and challenging weather. This robust design means you can take your brushless RC car to the beach, through creek beds, or in wet weather without worrying about moisture damage to your electronics, giving you the freedom to RC bash in almost any environment.
• High-Current Adjustable BEC — The integrated BEC (Battery Elimination Circuit) delivers 6V or 7.4V output at up to 4 Amps, providing clean, regulated power to your receiver and servos. This means you won't need a separate battery just for your radio system—the Firma 85A powers everything from a single LiPo pack, simplifying your wiring, reducing weight and freeing up precious space in your RC vehicle's chassis.
• Multi-Point Protection System — The Firma 85A includes comprehensive protection features that keep your electronics safe: over-current protection prevents damage from short circuits or stalling motors; automatic LiPo low-voltage cutoff protects your battery from over-discharging and damage; thermal protection monitors ESC temperature and prevents overheating; and failsafe protection ensures safe operation if your radio signal is lost. These layers of protection mean you can push your RC car hard without constantly worrying about damaging expensive components.
• Ready to Install with No Soldering — The Firma 85A comes ready to install with standard connectors and plug-and-play design. There's no soldering required, making installation quick and straightforward even for builders with limited experience. The compact form factor fits easily into most 1/10th scale chassis, and the mounting tabs provide secure, vibration-resistant installation.
• Multiple Programming Options — You can programme the Firma 85A using button programming for quick adjustments, the dedicated Smart ESC Programming Box for more detailed tuning, or the SmartLink USB Updating and Programmer application on your computer. This flexibility means you can programme your ESC at the field with simple button controls or dial in perfect settings at home with the full software interface—whatever suits your workflow.
• Developed by Spektrum Engineers — The Firma 85A was developed and designed by Spektrum engineers in partnership with the industry's leading ESC manufacturer, ensuring it meets the highest standards of performance, reliability and compatibility with the entire Spektrum Smart ecosystem. This collaboration between leading experts in RC electronics means you're getting technology that's been refined and tested at the highest levels of the hobby.
• Cooling Fan for Extended Runtime — An integrated cooling fan keeps the ESC cool during sustained high-power operation, preventing thermal throttling and allowing you to push the 85A rating harder and longer. This active cooling means you can run extended sessions without performance degradation due to heat buildup, whether you're competing in multiple heats or just enjoying a long afternoon of RC bashing.

Technical Performance

The Firma 85A Black Edition V2 is engineered specifically for 2S-3S LiPo battery setups, delivering consistent, controllable power across the full range of typical RC car batteries. With an 85-amp continuous current rating, this brushless ESC can safely handle high-performance brushless motors while providing smooth acceleration and reliable power delivery. The advanced 32-bit ARM M4 processor ensures that power delivery is optimised for efficiency and responsiveness, with sophisticated algorithms that manage current flow and thermal output. Built with an aluminium heat sink and active cooling fan, the ESC maintains optimal operating temperatures even during sustained high-current draws, ensuring performance remains consistent whether you're in the first heat or the final run. The waterproof design using rugged plastic casing means this ESC is built to withstand the demanding conditions of serious RC action—whether you're racing on wet tracks, bashing through muddy terrain, or tackling challenging outdoor courses. The compact size makes it suitable for installation in modern 1/10th scale chassis designs, whilst the mounting tabs provide secure, vibration-resistant fixing. The high-current adjustable BEC delivers clean power to your entire radio system, eliminating the need for a separate receiver battery and simplifying your setup. Every aspect of this ESC's engineering reflects Spektrum's commitment to building electronics that don't just perform well—they provide the data and intelligence that help you perform well.

What's in the Box

• SPM Firma 85A Black Edition Brushless Smart ESC V2
• Instruction documentation

What You Need to Complete

• 2S or 3S LiPo battery pack with appropriate connector (commonly IC3 or IC2 connectors on compatible Spektrum batteries)
• Spektrum DSMX/DSM2 compatible receiver
• Brushless motor suitable for 2S-3S LiPo operation
• RC vehicle chassis compatible with 1/10th scale applications
• Optional: Smart ESC Programming Box for advanced programming, or USB SmartLink programmer for computer-based configuration

Frequently Asked Questions

• Is the Firma 85A Black Edition suitable for beginners learning about brushless RC cars? — Yes, the Firma 85A is an excellent choice for someone moving from brushed to brushless electronics. The plug-and-play installation requires no soldering, and the programmable nature means you can adjust power delivery to suit your skill level. The real-time telemetry feedback actually helps beginners learn how their vehicle is performing by showing them data like temperature, voltage and RPM. However, this is definitely a performance-oriented ESC rather than a budget beginner option, so it's best suited for enthusiasts who are serious about the hobby and want premium features from the start.
• What battery does the Firma 85A Black Edition need? — The ESC is designed specifically for 2S or 3S LiPo batteries. A 2S battery provides 7.4 volts nominal (two cells at 3.7V each) and is ideal for lower-speed, high-torque applications or smaller motors, whilst a 3S battery delivers 11.1 volts nominal (three cells) for higher speed and performance. You'll need a battery with suitable connectors—many Spektrum Smart batteries use IC3 or IC2 connectors that plug directly into compatible systems. The ESC includes an automatic low-voltage cutoff that protects your LiPo battery from over-discharging, so you don't need to constantly monitor battery voltage.
• What makes the Smart telemetry in the Firma 85A different from other ESCs? — Traditional ESCs either provide no telemetry at all, or require additional sensors and modules to transmit data. The Firma 85A integrates telemetry directly into the ESC itself using a single wire connection, meaning no additional modules clutter your chassis or add weight. The telemetry data—including current draw, voltage, cell balance, temperature, RPM and capacity—transmits wirelessly to your Spektrum transmitter in real-time, allowing you to monitor performance as it happens rather than downloading data after each run. This real-time feedback lets you adjust your driving style, throttle response and vehicle setup on the spot to optimise performance.
• How does the Firma 85A Black Edition compare to other Spektrum ESCs at this amperage level? — The Firma 85A Black Edition V2 is the refreshed, second-generation version of Spektrum's 85-amp offering. Compared to the original Firma 85A, the V2 version includes updated firmware and refined performance tuning. If you're comparing it to other Spektrum options like the Firma 100A Black Edition, the 85A is better suited to lower-power applications and 2S-3S setups, whilst the 100A handles more demanding applications. The Firma 85A is part of the Smart ecosystem, meaning it works seamlessly with Spektrum Smart batteries and transmitters, whereas some other ESCs in the Spektrum range may use different communication protocols.
• Can I use this ESC with my existing Spektrum radio system? — The Firma 85A works with DSMX/DSM2 modulation, which is the standard Spektrum protocol. It will work with any modern Spektrum transmitter and receiver that supports this protocol. The Smart telemetry will only function fully with compatible Smart-enabled transmitters and receivers, but the ESC will operate perfectly well with standard Spektrum receivers—you'll just lose the real-time telemetry feedback feature and have a basic electronic speed control.
• Is the Firma 85A waterproof enough for wet conditions? — Yes, the Firma 85A is fully waterproof, making it suitable for use in wet grass, muddy terrain, creek beds and other damp environments. The rugged plastic case and sealed connectors protect the internal circuitry from moisture. However, you should still avoid submerging the ESC entirely or exposing it to prolonged immersion in salt water. For saltwater use, rinse the ESC with fresh water after each session to prevent corrosion.
• How long will the Firma 85A last before needing replacement? — With proper care and correct usage within its 85-amp rating, the Firma 85A should provide years of reliable service. The multi-point protection systems prevent damage from over-current, overheating, low voltage and signal loss, extending component lifespan. The cooling fan helps maintain optimal operating temperature, reducing thermal stress. Following the manufacturer's programming guidelines and not exceeding the amperage rating will ensure maximum 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 SPM Firma 85A Black Edition Brushless Smart ESC V2, 2S-3S P-SPMXSE2085 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.

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