Overview
The Spektrum S155 G2 1x55W AC Smart Charger represents a significant breakthrough in affordable RC charging technology. This advanced charger brings Smart G2 charging capabilities to every hobbyist, regardless of budget, making it an ideal choice for newcomers to the RC hobby as well as experienced pilots and drivers looking for a reliable, user-friendly charging solution. Whether you're charging LiPo batteries for your RC car UK setup, or managing a collection of NiMH packs across multiple vehicles, the S155 delivers professional-grade charging convenience without the premium price tag.
The Spektrum S155 is engineered specifically for RC enthusiasts who want the safety and simplicity of Smart charging technology without compromising on features. It's particularly excellent for cost-conscious new drivers and pilots who recognise that a quality charger is just as important as the vehicle itself. The 55-watt power output ensures efficient charging times, whilst the integrated Smart G2 technology means your batteries are always charged correctly and safely, every single time. With selectable IC3® and IC5® output ports built into the unit, you won't need to purchase separate adapters—everything you need is included.
What makes the S155 stand out in the ready to run RC market is its intuitive colour LCD screen interface combined with the revolutionary Auto Charge feature. When you connect a Smart battery, the charger instantly recognises the correct charging parameters and begins charging automatically. This means no manual programming is required, no guesswork about charge rates, and no risk of overcharging or damaging your expensive batteries. For anyone serious about their RC hobby, whether they're racing brushless RC cars or flying quadcopters, this charger is a game-changer.
Key Features
- Advanced Smart G2 Charging Technology — The S155 incorporates second-generation Smart charging technology that automatically recognises battery parameters and charging requirements, ensuring every battery is charged safely and optimally without user intervention or programming complexity.
- 55-Watt Charging Power — With 55 watts of continuous charging power, the S155 delivers fast, efficient charging whilst remaining affordable and accessible to all hobbyists, from weekend bashers to competitive racers.
- Integrated IC3® and IC5® Output Ports — Rather than requiring separate adapters, the S155 features selectable IC3® and IC5® charging ports built directly into the unit, eliminating the need for additional purchases and ensuring you can charge virtually any Smart battery straight out of the box.
- One-Connection Charging and Balancing — The revolutionary Smart G2 technology enables the S155 to charge and balance batteries simultaneously using just a single connection—no separate balance lead required, simplifying the charging process and reducing cable clutter on your workbench.
- Auto Charge Convenience — Simply connect your Smart battery and the charger automatically detects battery type, cell count, and optimal charging parameters, then begins charging immediately with zero configuration needed.
- Colour LCD Screen with Intuitive Interface — The high-visibility colour display features user-friendly menus, icons, and navigation tools that make adjusting settings and monitoring charging progress straightforward and stress-free.
- Real-Time Charge Countdown Clock — An on-screen clock counts down the remaining minutes until your battery reaches full charge, so you always know exactly when your RC car UK or aircraft will be ready for the next flight or run.
- Comprehensive Battery Compatibility — The S155 supports up to 4S LiPo, LiFe, Li-Ion, and LiHV batteries, plus 1-12S NiMH and NiCd packs, making it versatile enough for virtually every RC application from brushless RC models to older battery technology.
- USB Firmware Updates — Keep your charger updated with the latest firmware through a convenient USB port on the front of the unit, with no special cables or complicated procedures required.
- Portable, Durable Design — The sleek, sturdy case is engineered to fit perfectly on your workbench, and the detachable power cord makes it easy to pack into pit bags and field kits for transport to races, events, and flying fields.
- Sleep Mode — An energy-efficient sleep mode reduces power consumption when the charger is idle, helping you save on electricity whilst keeping the unit ready for use at a moment's notice.
- Multiple Protection Systems — The S155 includes reverse polarity protection, short circuit protection, over current protection, low input voltage protection, and thermal protection, ensuring your batteries and charger remain safe under all operating conditions.
- Peak Detection Technology — Sophisticated peak detection circuitry ensures charging stops automatically at the optimal moment, preventing overcharging and extending battery lifespan.
- Selectable Charge Rates — Users can programme charging rates from 3 to 5 amps, providing flexibility for different battery types and charging scenarios whilst maintaining safety margins.
Technical Performance
The Spektrum S155 G2 represents a carefully engineered balance between power, capability, and affordability. Delivering 55 watts of continuous charging power, the charger handles charging tasks quickly without generating excessive heat or stress on battery cells. The integrated internal balancer uses a JST_XH balance connector and works seamlessly with Smart G2 batteries to ensure each cell within a multi-cell pack charges to exactly the same voltage, a critical factor in maximising battery lifespan and performance. The charger's power input accepts standard UK and international AC mains supplies from 100-240V at 50-60Hz, making it compatible with any household outlet. The colour LCD display provides real-time monitoring with intuitive menus and icons, whilst the built-in amp meter and voltage meter allow precise tracking of charging progress. The unit weighs just 345 grams (12.2 ounces) and measures 112mm in length, 61mm in height, and 61mm in width, making it compact enough for workshop benches, pit tables, and field bags. The sturdy case construction protects internal circuitry whilst the detachable power cord adds to portability. Charging rates are programmable between 3 and 5 amps, with the charger automatically selecting appropriate rates for different battery chemistries including LiPo (3.7V per cell), LiFe (3.3V per cell), LiHV (3.8V per cell), Li-Ion (3.3V per cell), NiMH (1.2V per cell), and NiCd (1.2V per cell). The JST_XH balance connector ensures reliable connections with virtually all modern Smart batteries used in RC cars, trucks, and aircraft across the UK hobby market.
What's in the Box
- S155 AC Smart Charger
- Power Cord
- Instruction Manual
Frequently Asked Questions
- Is the Spektrum S155 G2 suitable for RC beginners and first-time users? — Absolutely. The S155 is specifically designed with beginners in mind. The Auto Charge feature means you connect your Smart battery and the charger handles everything automatically—no programming, no guesswork, no risk of mistakes. The colour LCD screen is intuitive and user-friendly, and the multiple safety protection systems (reverse polarity, short circuit, thermal, over current) ensure your expensive batteries stay safe even if you make a small error.
- What batteries can I charge with the S155 G2? — The S155 is extremely versatile. It charges up to 4S LiPo batteries (the most common for modern RC cars and drones), plus LiFe, Li-Ion, and LiHV batteries. It also supports 1-12S NiMH and NiCd packs, meaning it works with both modern brushless battery setups and older NiMH technology. For maximum benefit from Smart features like Auto Charge and integrated balancing, use Smart batteries, though the charger works with any compatible battery type.
- Do I need separate adapters or balance leads for the S155? — No. The S155 includes both IC3® and IC5® output ports built directly into the charger, eliminating the need for separate adapters. With Smart G2 batteries, charging and balancing happen through a single IC3® or IC5® connection—no separate balance lead is required, which simplifies your charging setup considerably.
- How long does it take to charge a battery with the S155? — Charge time depends on battery capacity and your selected charge rate. The S155 delivers 55 watts of power and supports charge rates from 3 to 5 amps. The colour LCD screen includes a real-time countdown clock that shows exactly how many minutes remain until your battery is fully charged, so you always know when your RC vehicle will be ready for action.
- What makes Smart G2 technology better than regular chargers? — Smart G2 technology is revolutionary because it completely eliminates programming and guesswork. When you connect a Smart battery, the charger instantly reads the battery's internal chip, automatically detects the cell count, chemistry, and current state of charge, then begins charging with the optimal parameters. This means maximum safety, faster charging, and longer battery lifespan. It's perfect for UK RC hobbyists who want professional results without technical complexity.
- Can I update the S155 firmware myself? — Yes. The charger includes a USB port on the front of the unit for easy firmware updates. Simply connect the provided cable to a computer and follow the included instructions—no special software or technical knowledge required. Updates add new features and improve compatibility with new battery types.
- Is the S155 portable enough for racing and field use? — Definitely. The S155 weighs only 345 grams and measures just 112mm × 61mm × 61mm, making it compact and lightweight. The detachable power cord allows it to pack flat into pit bags or field kits. The sturdy case protects it during transport, and the sleek design fits well on any pit table or workbench. This makes it ideal for travelling to races, track days, or flying fields across the UK.
- What protection systems does the S155 include? — The S155 is packed with safety features: reverse polarity protection prevents damage if you connect leads backwards, short circuit protection guards against accidental shorts, over current protection limits dangerous current spikes, low input voltage protection ensures the charger won't operate with insufficient mains power, thermal protection shuts down the charger if internal temperature gets too high, and peak detection technology prevents overcharging. These multiple layers of protection mean your batteries and charger stay safe under virtually any circumstance.
- How is the S155 different from more expensive Smart chargers? — The S155 delivers all the core Smart G2 advantages—Auto Charge, integrated balancing, intuitive colour LCD interface, and comprehensive battery support—at a significantly lower price point than premium chargers. Whilst you might find chargers with higher wattage ratings or additional specialised features at higher price points, for standard RC hobby use, the S155 offers exceptional value. It's the perfect choice for cost-conscious hobbyists who refuse to sacrifice quality or features.
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 S155 G2 1x55W AC Smart Charger O-SPMXC2050I 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.
