- Battery Type: Lithium Polymer (LiPo)
- Configuration: 4S (four cells in series)
- Nominal Voltage: 14.8V
- Fully Charged Voltage: 16.8V
- Capacity: 300mAh
- Discharge Rate: 30C continuous
- Maximum Continuous Discharge Current: 9 amps
- Connector Type: JST
- Compatibility: 3S and 4S compatible brushless RC systems
- Suitable Aircraft Type: Micro RC aircraft and drones
- Typical Aircraft Weight Range: 200-400g
- Typical Flight Time: 8-15 minutes depending on aircraft and flying style
- Charging Requirements: Dedicated LiPo charger required
- Storage: Room temperature in fireproof container
- Manufacturer: Spektrum
- Model Number: SPMX3004SJ30
Overview
The SPM 4S 14.8V 300mAh 30C LiPo Battery JST is a compact, high-performance lithium polymer battery designed specifically for micro and ultra-compact RC aircraft and drones. This Spektrum-branded power cell delivers the reliable energy needed to keep your small-scale RC model flying with consistent power and performance. Whether you're piloting an E-flite Micro DRACO or another compatible micro aircraft, this battery offers the perfect balance of capacity and weight for the demanding requirements of micro-scale RC flight in the UK hobby market.
Compact LiPo batteries like this are essential for anyone serious about RC flight. The 300mAh capacity is precisely calibrated for ultra-lightweight aircraft where every gram matters, and the 30C discharge rate ensures you get responsive, dynamic performance when you need it most. This is the ideal spare battery for your RC aeroplane, allowing you to extend your flying sessions without the weight penalty of larger capacity cells that would compromise your model's flight characteristics.
The JST connector type ensures secure, reliable connections to compatible RC equipment, and the 4S cell configuration (14.8V nominal) is specifically designed to work with advanced Spektrum brushless flight controllers and ESCs. Whether you're a seasoned RC flyer upgrading your power system or discovering the world of micro RC aircraft for the first time, this Spektrum battery represents genuine, factory-authorised quality built to trusted aviation standards.
Key Features
- 4S LiPo Chemistry — The four-cell configuration delivers 14.8V nominal voltage, providing the precise power delivery required by modern brushless RC flight systems and Spektrum control units, ensuring optimal motor performance and consistent thrust throughout your flight.
- 300mAh Capacity — This capacity is specifically engineered for micro-scale RC aircraft where weight is absolutely critical; it provides sufficient energy for meaningful flight times without the excessive mass that would compromise aerodynamic performance and manoeuvrability.
- 30C Discharge Rate — The 30C rating means this battery can safely deliver 9 amps of continuous current, giving you snappy throttle response, dynamic acceleration and the power headroom needed for aggressive manoeuvres and high-performance flying in your RC aeroplane.
- JST Connector — The industry-standard JST connector type ensures compatibility with Spektrum flight controllers, ESCs and other leading RC systems, providing a secure connection that won't slip or disconnect during flight operations.
- Spektrum Factory Quality — This is an authorised Spektrum product built to factory specifications, guaranteeing consistent cell matching, proper internal resistance characteristics and reliable performance across multiple charge cycles.
Technical Performance
The SPM 4S 14.8V 300mAh 30C LiPo Battery JST represents precision engineering optimised for the ultra-demanding world of micro-scale RC aircraft. The four 3.7V lithium cells are meticulously matched during manufacturing to ensure balanced charging, even voltage delivery and long operational lifespan. At 300mAh capacity, this battery is purpose-built for aircraft in the 200-400g range, where every gram directly impacts flight duration and handling characteristics. The 30C continuous discharge rating provides 9 amps of available current, which is generous for micro brushless motors yet appropriate for the power systems found in compact RC aeroplanes. The JST connector is the professional standard in micro RC aviation, offering a secure, polarised connection that eliminates the risk of reverse polarity connection. The 4S configuration (14.8V) is specifically designed to work with advanced Spektrum brushless ESCs and flight controllers, ensuring voltage compatibility with integrated receiver systems. LiPo technology delivers significantly better energy density than older NiMH batteries, meaning you get more flight time per gram of battery weight—a critical advantage in micro-scale RC where total aircraft weight directly determines flight performance, manoeuvrability and endurance. This battery is suitable for use with 3S and 4S compatible brushless RC aircraft systems.
What's in the Box
- Spektrum 4S 14.8V 300mAh 30C LiPo Battery with JST connector
Frequently Asked Questions
- Is this battery suitable for the E-flite Micro DRACO? — Yes, the SPM 4S 14.8V 300mAh 30C LiPo Battery is specifically included with the E-flite Micro DRACO 800mm BNF Basic Ultimate Combo, making it the ideal power source for this popular micro RC aircraft model.
- What voltage is this battery and why does that matter? — This is a 4S LiPo battery delivering 14.8V nominal voltage (16.8V when fully charged). The 4S configuration is specifically designed to work with Spektrum brushless ESCs and flight controllers found in modern micro RC aircraft, ensuring proper voltage compatibility for optimal motor performance.
- How long will 300mAh provide flight time? — Flight duration depends on your aircraft's weight, motor efficiency and flying style, but micro RC aircraft typically achieve 8-15 minutes of flight time per charge with a 300mAh battery. Having spare batteries is essential for extended flying sessions.
- What is the 30C discharge rate and why is it important? — The 30C rating means this battery can safely deliver 9 amps of continuous current (30C × 0.3Ah = 9A). This provides responsive throttle control, crisp acceleration and enough power headroom for dynamic flying manoeuvres in your RC aeroplane without overloading the battery.
- What does JST connector mean and is it the industry standard? — JST is the connector type (Japan Solderless Terminal), and it is the professional standard for micro RC aircraft and drones. The JST connector ensures a secure, polarised connection that won't slip during flight and is compatible with Spektrum flight controllers and ESCs.
- Can I use this battery with non-Spektrum aircraft? — This battery features a JST connector and 4S voltage, making it compatible with any micro RC aircraft equipped with a JST connector and 4S-compatible brushless ESC. However, it is specifically designed and tested with Spektrum systems.
- How do I care for and charge this LiPo battery? — LiPo batteries require a dedicated LiPo charger (not standard NiMH chargers). Always charge in a safe location away from flammable materials, never overcharge or fully discharge, and store at room temperature in a fireproof container. Spektrum recommends using a Spektrum Smart Charger for optimal battery health and 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 4S 14.8V 300mAh 30C LiPo Battery JST 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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