Spektrum 7.4V 2S Smart G2 LiPo Receiver Battery Overview
Drivers and pilots enjoy even more Smart advantages when using Spektrum™ Smart G2 LiPo batteries. "Generation 2" features make these powerful LiPo packs even simpler and safer to use together with your Smart charger.
For example, Spektrum Smart G2 technology makes it much easier to balance charge your LiPo batteries. Balancing information travels through the unique data wire of each Smart G2 battery's innovative IC3® connector. As a result, only a single connection is needed - no separate balance lead is required.
Smart G2 batteries come from the factory programmed to discharge automatically to a safe storage voltage of 3.90V after 72 hours of inactivity. The benefits include longer battery life, better performance over the life of the pack, and the peace of mind that comes from knowing your Smart battery is maintenance-free. You can change the battery's Auto Storage settings based on your own preferences. G2 batteries also offer a storage discharge rate that's three times faster than the previous G1 Smart batteries.
Smart G2 soft-case LiPo packs also include thicker internal metal side plates. These plates improve heat dissipation and provide more protection for the cells against punctures during rough landings or in similar impact-prone situations.
As with other Smart batteries, you'll never have to set your own charging preferences for a Spektrum Smart G2 battery until you want to. When a Smart G2 LiPo battery is connected to a Spektrum™ Smart charger, its unique charging parameters and health information upload to the charger from the battery's integrated memory microchip. Through the charger you can view and set preferences such as charge rates, so all that's required to charge the pack is connecting it to your Smart charger. Smart technology takes care of the rest.
Spektrum Smart G2 LiPo batteries store a wide variety of essential information, including:
- Battery Brand
- Battery Type
- Battery Capacity
- Battery C Rating
- Individual Cell Voltage
- Battery Temperature
- Charge/Discharge Cycles
Spektrum Smart G2 LiPo batteries also maintain an error log including the number of over-heat, over-discharge and over-charge incidents. This data can be helpful in assuring that the battery you've chosen is right for the application. Innovative Spektrum Smart G2 LiPo batteries are so easy to use, they nearly take care of themselves. It's easy to achieve peak battery performance, reliability and longevity with Smart G2 technology!
Note: Smart G2 batteries require the use of a Spektrum Smart Charger. Update your Spektrum Smart Charger for all the latest advancements in Smart Technology.
Spektrum 7.4V 2S Smart G2 LiPo Receiver Battery Features
- Simpler and safer to use
- Balance charge through the IC3® connector data wire - with only one connection, no balance lead required
- Faster Auto Discharge at up to 1.5A to safe storage voltage for long battery life and improved performance
- Thicker internal metal side plates protect cells and improve heat dissipation
- Integrated microchip stores unique parameters for each battery
- IC3® connectors are also compatible with EC3™ style
- Spektrum Smart charger required
Spektrum Smart G2 Family
- Product name: Spektrum 7.4V 4000mAh 2S 15C Smart G2 Receiver LiPo Battery with IC3 connector
- Model number (Spektrum): SPMX40002SRX
- Retail model number: O-SPMX-1057
- Battery type: LiPo (Lithium Polymer)
- Battery voltage: 7.4V nominal
- Voltage per cell: 3.7V
- Capacity: 4000mAh
- Number of cells: 2S (2 cells in series)
- Discharge rating: 15C
- Continuous discharge current: 60 amps (15C × 4000mAh)
- Maximum charge current: 1.5C (6000mA)
- Maximum charge rate: 1.5C
- Total energy capacity: 14.8 watt-hours
- Wire gauge: 13 AWG
- Primary connector: IC3 (next-generation smart connector with data wire)
- Secondary connector: Standard servo connector (for discharge lead)
- Discharge lead length: 3.5 inches (90mm)
- Connector compatibility: IC3 and IC5 connectors fully backward compatible with EC3 and EC5 systems
- Smart technology: Spektrum Smart G2 (Generation 2)
- Smart technology type: G2 (not G1)
- Integrated microchip: Yes (stores battery parameters and health data)
- Charge protection circuitry: Yes
- Case material: Soft case with thicker internal metal side plates
- Hard case: No
- Product length: 3.4 inches (86mm)
- Product width: 1.3 inches (34mm)
- Product height: 1.2 inches (30mm)
- Product weight: 8.11 ounces (230 grams)
- Application: Air (RC aeroplanes, helicopters, multi-rotors)
- Product application: Air and Auto (general receiver applications)
- Storage capability: Yes (includes automatic smart discharge feature)
- Smart discharge feature: Yes (automatically discharges to safe storage voltage between 12-240 hours at user-set intervals)
- Default auto storage voltage: 3.90V
- Auto storage discharge rate: Three times faster than G1 Smart batteries
- Balance charging method: One-wire through IC3 data connector (no separate balance lead required)
- Data stored on microchip: Battery brand, battery type, battery capacity, C rating, cell count, battery temperature, charge/discharge cycle count, internal resistance, unhealthy event log (overcharge incidents, over-discharge incidents, over-temperature incidents)
- User-assignable smart discharge: Yes (discharge interval customisable)
- California Proposition 65 warning: Included
- Roar approved: No
- Includes: Battery, servo connector discharge lead, instruction manual, multilingual battery safety sheet
- Customer rating: 5 out of 5 stars
- Manufacturer: Spektrum (Horizon Hobby)
Overview
The Spektrum 7.4V 4000mAh 2S 15C Smart G2 Receiver LiPo Battery represents the next generation of intelligent battery technology for RC enthusiasts across the UK. Whether you're piloting an RC aeroplane, running an RC car UK-wide, or operating any receiver-equipped RC system, this professional-grade power source delivers reliable performance with unprecedented convenience. The Smart G2 technology means you'll spend less time managing batteries and more time enjoying your hobby, with automatic charging parameters that upload directly to your Spektrum Smart charger at the touch of a button.
Designed specifically for receiver-powered systems, this 4000mAh capacity battery provides ample runtime for extended flying or driving sessions without the bulk of larger packs. The intelligent microchip embedded within stores vital information about your battery's health, charging history, and performance data, ensuring you always know exactly what condition your battery is in. For RC enthusiasts seeking reliability, safety, and the latest in battery management technology, this Spektrum Smart G2 receiver battery is the ideal choice. Ready to run RC systems equipped with Spektrum receivers will perform at their absolute best when powered by this cutting-edge battery pack.
What truly sets this battery apart is the revolutionary Smart G2 technology that learns your preferences and adapts to your charging habits. The integrated microchip remembers your last charge rate and automatically pre-populates these settings the next time you connect the battery to your charger. This means you'll never have to manually configure charging parameters again – simply press the "Start" button and let Smart technology take care of the rest. It's the perfect battery for serious RC pilots and drivers who demand both performance and peace of mind.
Key Features
- Spektrum Smart G2 Technology — This next-generation smart battery system automatically uploads its unique charging parameters and battery health information to your Spektrum Smart charger, eliminating the need for manual configuration and making every charge as simple as pressing a button.
- Integrated Microchip with Data Memory — An intelligent microchip stores essential battery information including brand, type, capacity, C rating, temperature, cell count, and maintains a comprehensive log of charging and discharging cycles, as well as any unhealthy events such as overcharge, over-discharge, or overtemperature incidents.
- IC3 Connector with Full Backward Compatibility — The next-generation IC3 connector features innovative design with a dedicated data transfer wire for communicating battery information to your charger, whilst remaining fully compatible with older EC3-equipped systems, giving you flexibility and future-proofing for your RC investments.
- One-Wire Balance Charging — Smart G2 technology transmits all balance charging information through the single IC3 data wire, eliminating the need for a separate balance lead and simplifying your charging setup significantly.
- Automatic Smart Discharge — Once programmed with your preferred settings on a Spektrum Smart charger, this battery will automatically discharge itself to a safe storage voltage after a period you choose between 12 and 240 hours, protecting battery cells from damage caused by prolonged storage at full charge.
- Three Times Faster Storage Discharge — Compared to previous G1 Smart batteries, the G2 technology offers storage discharge rates three times faster, getting your battery to safe storage voltage more quickly without requiring manual intervention.
- Thicker Internal Metal Side Plates — The soft-case LiPo construction includes reinforced internal metal side plates that improve heat dissipation during use and provide superior protection for cells against punctures during rough landings or impact situations common in RC flying and driving.
- User-Customisable Charge Rates — Take full advantage of this battery's 1.5C maximum charge rate capability by customising your charge rate through the Spektrum Smart charger, allowing you to balance charging speed with battery longevity based on your needs.
- Included Servo Connector Discharge Lead — The battery comes with a standard servo connector discharge lead measuring 3.5 inches (90mm) for convenient storage discharge, adding practicality to the Smart discharge feature.
- Compact Receiver-Optimised Form Factor — Weighing just 230 grams (8.11 ounces) and measuring 86mm in length, 34mm in width, and 30mm in height, this battery is designed to fit compact receiver compartments whilst still delivering substantial 4000mAh capacity for extended runtime.
Technical Performance
The Spektrum 7.4V 4000mAh 2S 15C Smart G2 Receiver LiPo Battery delivers impressive technical specifications engineered for demanding RC applications. With a nominal voltage of 7.4V across two cells, each 3.7V LiPo cell, this battery provides the ideal power signature for modern receiver systems in RC aeroplanes, RC cars UK, boats, and multi-rotor systems. The 4000mAh capacity represents a substantial energy reservoir, offering considerably longer runtime compared to smaller receiver batteries whilst maintaining the compact dimensions necessary for tight receiver compartments. The 15C discharge rating means this battery can safely deliver 60 amps of continuous current (15 times its 4000mAh capacity), providing instantaneous power delivery for servo actuation and receiver function without voltage sag under demanding conditions. The integrated charge protection circuitry prevents overcharging, over-discharging, and thermal events that could compromise battery integrity. The 1.5C maximum charge current (6000mA) allows relatively rapid charging without stressing the cells, and when paired with a Spektrum Smart charger, the battery's microchip ensures optimal charge parameters are applied automatically. The soft-case construction with thicker internal metal side plates balances weight savings against durability and heat management, making this battery suitable for the vibrations and impacts common in RC motorsports and aviation. The 13 AWG wire gauge provides sufficient current-carrying capacity whilst maintaining acceptable weight. With a total energy capacity of 14.8 watt-hours and support for both air and automotive applications, this battery represents a versatile, intelligent power solution for discerning RC enthusiasts across the United Kingdom.
What's in the Box
- Spektrum 7.4V 4000mAh 2S 15C Smart G2 Receiver LiPo Battery with IC3 connector
- Standard servo connector discharge lead (3.5 inches / 90mm length)
- Instruction manual
- Battery safety sheet (multilingual)
Frequently Asked Questions
- What is Spektrum Smart G2 technology and why should I care about it? — Spektrum Smart G2 is a revolutionary battery management system that stores your battery's health data, charging history, and preferences on an integrated microchip. When you connect the battery to a compatible Spektrum Smart charger, all this information uploads automatically, and the charger remembers your preferred charge rate from the last time you used it. This means you literally just press "Start" and the charger handles everything else. Beyond convenience, Smart G2 technology includes automatic storage discharge that protects your battery by discharging it to a safe voltage after a set period of inactivity – this dramatically extends battery lifespan by preventing the chemical damage that occurs when LiPo cells sit fully charged for extended periods.
- Is this battery compatible with my existing RC equipment? — Yes, absolutely. This battery features the next-generation IC3 connector, which is fully backward compatible with older equipment that uses EC3 connectors. You can use this Smart battery with any existing EC3-equipped system. However, to access all the Smart features like automatic charging parameters and Smart discharge, you'll need to connect it to a Spektrum Smart charger. Without a Smart charger, it functions as a standard LiPo battery, but you won't have access to the intelligent features that make Smart batteries special.
- How long will this battery last per flight or drive session? — Runtime depends on your specific RC application and the current draw of your equipment. With 4000mAh capacity, a typical receiver system drawing 2-3 amps would provide roughly 1.5-2 hours of continuous operation. However, most RC flying and driving isn't continuous high-draw – actual runtime will vary considerably based on your flying style, driving pattern, and the power demands of your servos and receiver. The Smart battery's data logging will help you track actual usage patterns over time.
- What's the difference between this G2 battery and older Spektrum Smart G1 batteries? — Smart G2 represents a significant advancement over G1 technology. The most notable improvements include three times faster storage discharge rate (getting your battery to safe storage voltage much more quickly), one-wire balance charging through the IC3 connector (no separate balance lead needed), and thicker internal metal side plates in the soft case for better heat dissipation and cell protection. G2 batteries also come pre-programmed from the factory to auto-discharge to 3.90V after 72 hours of inactivity, and you can adjust this setting to suit your preferences. Both systems use Smart technology, but G2 is the more advanced implementation.
- Can I use this battery with my transmitter as well as my receiver? — This battery is specifically designed and rated for receiver applications. Whilst the IC3 connector may physically fit some transmitter systems, you should always use the battery recommended by your transmitter manufacturer. Transmitter power systems have different requirements and safety margins than receiver batteries. Never substitute or experiment with battery compatibility – always consult your equipment's manual.
- How should I store this battery when not in use? — One of the major advantages of Smart technology is that storage becomes nearly automatic. Simply set your storage discharge preferences on your Spektrum Smart charger (you can choose any interval between 12 and 240 hours), and the battery will automatically discharge itself to the safe storage voltage of 3.90V. This prevents the chemical damage that occurs when LiPo cells sit fully charged. If storing for extended periods, keep the battery in a cool, dry place away from direct sunlight. Many RC enthusiasts use dedicated LiPo storage bags for added safety.
- Is this receiver battery suitable for my RC aeroplane? — Yes, receiver batteries are designed specifically for RC aeroplanes, helicopters, and other aircraft where receiver power is critical. The 4000mAh capacity provides excellent runtime for typical RC flying sessions, and the lightweight design (230 grams) minimises impact on your aircraft's performance. Always ensure your aircraft's fuselage compartment can accommodate the battery's dimensions (86 x 34 x 30mm) before purchase.
- What safety protections does this battery include? — This battery includes integrated charge protection circuitry that prevents dangerous overcharging. The Smart technology adds an additional layer of safety by monitoring battery temperature, voltage, and charge cycles, logging any problematic events. The battery stores temperature data and will alert you to overheating issues. The soft case with internal metal side plates provides physical protection against punctures from impacts. Additionally, the automatic smart discharge feature prevents long-term storage at full charge, which is a leading cause of LiPo battery degradation and fire risk.
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 7.4V 4000mAh 2S 15C Smart G2 Receiver LiPo Battery: IC3 O-SPMX-1057 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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