Gens Ace 3S 11.1V 300mAh 45C LiPo Battery Pack with JST Connector O-G3S0300-45JST

• Brand: Gens Ace
• Model Number: O-G3S0300-45JST
• Barcode: 6928493307380
• Battery Type: Lithium Polymer (LiPo)
• Cell Configuration: 3S1P (3 cells in series, 1 cell in parallel)
• Nominal Voltage: 11.1V (3S)
• Fully Charged Voltage: 12.6V
• Capacity: 300mAh
• Continuous Discharge Rate: 45C
• Maximum Continuous Discharge Current: 13.5A (300mAh × 45C)
• Connector Type: JST-SYP plug
• Case Type: Soft Case
• Length: 40mm
• Width: 21mm
• Height: 17mm
• Weight: 26g

Overview

The Gens Ace Li-Po 3S 11.1V 300mAh 45C with JST connector (part number O-G3S0300-45JST) is a compact and lightweight lithium polymer battery pack designed for RC enthusiasts who demand reliable power delivery in a minimal footprint. Whether you're piloting a small-scale RC car, drone, or compact aerial platform across the UK, this 3S1P LiPo battery provides the energy density and discharge capability needed for responsive, consistent performance. Gens Ace is one of the world's most recognised battery corporations, with over 20 years of advanced battery technology expertise and a team of 200 professional engineers and technicians dedicated to delivering exceptional quality and optimisation across their entire product range.

This battery is ideal for RC hobbyists who are building compact RC models where weight and space are critical constraints. The 300mAh capacity delivers sufficient runtime for short bursts of high-performance flying, crawling, or racing, whilst the 45C continuous discharge rate ensures the battery can handle demanding power requirements without sagging voltage. The soft case design protects the cells during transport and storage, and the JST-SYP connector provides a secure, reliable interface with compatible RC equipment.

Gens Ace's commitment to "excellent quality", "optimisation" and "priority in sales and services" means every cell in this battery has been engineered and tested to deliver consistent performance. The brand tailors its batteries for various scales of RC models including electronic cars, aeroplanes, vessels and specialist RC applications, ensuring that whether you're a seasoned competitor or exploring the world of RC for the first time, you'll find a battery solution that meets your exacting needs.

Key Features

• 3S1P cell configuration (11.1V nominal) — Three cells in series provide 11.1 volts nominal output, delivering the voltage required by most small-scale RC models, drones and lightweight aerial platforms. This voltage is ideal for brushless and brushed motor applications in compact RC cars and aeroplanes.
• 300mAh capacity — The modest but purposeful capacity of 300mAh is perfectly suited to ultralight RC models and applications where every gram of weight matters. This capacity provides sufficient runtime for multiple flight cycles or racing runs before requiring a recharge.
• 45C continuous discharge rate — The 45C rating means this battery can safely deliver 13.5 amps of continuous current (300mAh × 45C), enabling it to power demanding brushless motors and high-performance RC setups without voltage sag or thermal stress.
• JST-SYP connector — The industry-standard JST-SYP plug provides a secure mechanical and electrical connection to compatible RC receivers, ESCs, and power distribution boards, ensuring reliable power delivery throughout your flight or run.
• Compact dimensions (40 × 21 × 17mm) — Measuring just 40mm in length, 21mm in width and 17mm in height, this battery is small enough to fit into the tightest fuselages, chassis and confined spaces, making it ideal for micro RC aeroplanes, compact racing drones and miniature ground-based RC vehicles.
• Lightweight at 26 grams — Weighing just 26 grams, this battery adds minimal mass to your RC model, preserving agility, responsiveness and maximum flight or run time. Every gram saved in battery weight can be redirected toward payload, range or acceleration.
• Soft case protection — The protective soft case safeguards the battery cells from physical damage, punctures and short circuits during transport, storage and field use, extending the lifespan of your investment and ensuring safety.
• 20 years of Gens Ace battery engineering — Gens Ace's two decades of lithium polymer cell research and manufacturing expertise is embedded in every battery they produce, meaning you benefit from proven thermal stability, cycle life and safety protocols.

Technical Performance

The Gens Ace 3S 11.1V 300mAh 45C LiPo battery represents a precision-engineered power solution for weight-conscious RC applications. The 3S cell configuration delivers 11.1 volts nominal output (12.6V fully charged), providing the voltage sweet spot for most small-scale brushless and brushed motor systems found in RC cars, helicopters and fixed-wing aircraft. The 45C continuous discharge rating is particularly significant: calculated at 300mAh × 45C, this equates to a maximum continuous current output of 13.5 amps, comfortably handling high-performance ESC demands and transient current spikes during aggressive acceleration or aerobatic manoeuvres. The battery's construction utilises advanced lithium polymer cell chemistry, which offers superior energy density compared to older nickel-metal hydride batteries, meaning more power in a lighter, more compact package. The JST-SYP connector is widely recognised across the RC hobby and is compatible with the vast majority of aftermarket RC receivers, electronic speed controllers and power distribution systems. At just 26 grams, the battery contributes minimal mass to your model whilst delivering the current capacity required for responsive, stable flight characteristics. The soft-case outer covering protects against physical damage, accidental punctures and short circuits, whilst also providing thermal insulation during charge and discharge cycles. Gens Ace's manufacturing processes incorporate rigorous quality control and testing protocols developed over two decades of battery development, ensuring consistent cell performance, voltage stability and thermal safety across the entire product range.

What's in the Box

• Gens Ace 3S 11.1V 300mAh 45C LiPo battery pack with soft case
• JST-SYP connector pre-soldered and ready to use

Frequently Asked Questions

• Is the Gens Ace 300mAh 3S LiPo battery suitable for beginners to RC flight and racing? — Yes, this battery is an excellent choice for beginners exploring small-scale RC aeroplanes, micro drones and compact racing platforms. The modest 300mAh capacity means longer charging times between flights, making it ideal for learning at a controlled pace, and the 11.1V output is compatible with entry-level brushless and brushed ESC setups. The soft case design also provides additional safety and protection during the learning phase.
• What type of RC models work best with a 300mAh 3S battery? — The 300mAh capacity is specifically engineered for ultralight RC applications including micro fixed-wing aeroplanes, racing drones, small racing quadcopters, lightweight helicopter platforms and miniature RC cars. If you're looking to power larger models or require extended runtime, you'll need a higher-capacity battery such as 500mAh, 850mAh or 1000mAh options.
• How long does the Gens Ace 300mAh battery take to charge? — Charging time depends on your charger's output capacity and charge rate. Using a standard 1C charger (charging at 300mA), expect approximately 60 minutes of charge time from completely depleted to full capacity. A 2C charger would reduce this to approximately 30 minutes. Always use a dedicated LiPo charger with balancing capability to ensure safe, even charging across all three cells.
• Is the JST-SYP connector widely supported? — The JST-SYP connector is one of the most widely used plugs in the RC hobby and is compatible with the vast majority of aftermarket RC receivers, ESCs and power distribution boards. However, if your RC model uses a different connector type (such as Deans, XT60 or Spektrum Ultra Plug), you will need to either solder an adapter or replace the connector on the battery.
• What makes Gens Ace batteries different from other LiPo brands? — Gens Ace brings 20 years of dedicated battery engineering expertise, employing 200 professional engineers and technicians. The brand emphasises "excellent quality", "optimisation" and "priority in sales and services". Gens Ace batteries are engineered and tested for consistent performance across a wide range of RC applications, from entry-level models to competitive racing platforms, and the company tailors batteries for various scales including RC cars, aeroplanes, vessels and specialist applications.
• Can I use this battery in my existing RC model? — Compatibility depends on three factors: voltage (this battery is 11.1V nominal for 3S applications), connector type (this uses JST-SYP), and weight budget (26 grams). Check your RC model's documentation or ESC specifications to confirm it supports 3S LiPo batteries and can accept a JST-SYP connector, or verify that your battery connections can be adapted.
• How should I store the Gens Ace 300mAh battery when not in use? — Store the battery in a cool, dry location away from direct sunlight, extreme heat and moisture. For extended storage (more than one month), charge the battery to approximately 50% capacity (around 3.7-3.8V per cell) to preserve cell longevity. Always use the soft case for protection and store in a fire-resistant LiPo storage bag as a safety precaution.

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 GENSACE Li-Po 3S 11.1V 300mAh 45C with JST O-G3S0300-45JST 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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