eTronix 4S 30cm Balance Lead Extension Wire JST-XH Connector ET0247

Overview

The eTronix 4S 30cm Balance Lead Extension Wire (JST-XH) ET0247 is an essential accessory for any RC enthusiast charging 4-cell LiPo batteries. Whether you're running an RC car, boat, aircraft or multirotor, this extension lead provides the extra reach you need to set up a safe, organised charging station without straining your balance connectors. At just 30 centimetres in length, this balance lead extension offers the flexibility to position your batteries securely in a charging bag or on the workbench whilst keeping the balance connector easily accessible for monitoring and charging. The eTronix brand is recognised across the RC hobby for producing reliable, quality charging accessories, and this balance lead extension is no exception.

For RC enthusiasts in the UK looking to improve their charging setup, this 4S balance lead extension is a practical solution that reduces stress on your charger's balance port and battery connectors. The widely adopted JST-XH connector interface ensures compatibility with the vast majority of modern 4S LiPo packs and balance chargers on the market today. Whether you're a seasoned racer, a weekend basher, or just getting started with RC cars and drones, having a quality balance lead extension makes a real difference to the safety and convenience of your charging routine. RC Model Shop stocks this essential accessory because we understand that proper charging setup is critical to battery longevity and safe operation of your RC models.

This is the kind of accessory that might seem small, but it genuinely improves your RC experience. Instead of awkwardly bending your battery balance leads to reach the charger port, or having to position your batteries in uncomfortable locations during charging, this extension gives you the freedom to set up your charging area exactly how you want it. At an affordable price point, the eTronix 4S 30cm Balance Lead Extension Wire represents excellent value for money and is a worthwhile investment for any serious RC hobbyist.

Key Features

• 30 Centimetre Extension Length — The 30cm length provides a practical balance between reach and manoeuvrability, allowing you to position your 4S LiPo batteries away from your charger whilst still keeping the balance connector accessible for checking cell voltages during the charging process.
• JST-XH Connector Interface — This balance lead extension uses the industry-standard JST-XH connector, which is the most widely adopted balance connector found on modern 4S LiPo batteries and charger balance ports, ensuring broad compatibility across your RC fleet regardless of brand or model.
• Reduced Strain on Connectors — By extending the reach between your charger and battery, this lead reduces the mechanical stress placed on both the battery's balance connector and your charger's balance port, helping to extend the lifespan of both components.
• Enhanced Charging Station Safety — This extension lead allows you to safely position your batteries in a dedicated charging bag or fireproof container away from your workbench, reducing the risk of accidental damage or interference whilst charging.
• Universal RC Compatibility — The 4S configuration makes this balance lead suitable for use with any 4-cell LiPo battery pack, whether you're charging batteries for RC cars, boats, aircraft, FPV drones, quadcopters or any other RC vehicle type.
• Quality eTronix Construction — eTronix is a trusted brand in the RC charging accessory market, and this balance lead extension is manufactured to reliable standards with proper connectors and wire gauging to safely handle the requirements of 4S LiPo charging.
• Practical Length for Bench Setup — At 30 centimetres, this extension is long enough to give you proper reach and flexibility in positioning batteries during charging, but short enough to avoid unnecessary cable clutter or tangling on your workbench or charging station.
• Easy to Use and Install — This is a plug-and-play accessory requiring no installation, modification or technical knowledge; simply connect one end to your charger's 4S balance port and the other to your battery's balance connector.

Technical Performance

The eTronix 4S 30cm Balance Lead Extension Wire is engineered with the specific requirements of LiPo battery charging in mind. The extension lead features properly rated JST-XH connectors on both ends to ensure secure, reliable connections without any risk of loose contacts that could cause charging errors or safety issues. The 30 centimetre length of wire has been calculated to provide adequate reach for typical RC charging setups whilst maintaining electrical integrity and minimising voltage drop across the extension. The wire gauge and connector quality are designed to safely handle the current flows involved in 4S LiPo battery charging, whether you're using a basic balance charger or a more advanced programmable charger with integrated balance functionality. This extension lead works seamlessly with any charger featuring a JST-XH balance connector, including popular options from brands like eTronix itself, iCharger, SkyRC, Hobbywing and many others. The build quality ensures this will be a reliable part of your RC charging infrastructure for years to come, with no need for replacement or maintenance beyond basic care. For RC enthusiasts building a permanent charging station, this extension lead is one of those small investments that pays dividends in convenience and safety.

What's in the Box

• eTronix 4S 30cm Balance Lead Extension Wire with JST-XH connectors (both ends)

Frequently Asked Questions

• Is this balance lead extension suitable for my 4S LiPo battery charger? — Yes, provided your charger features a JST-XH balance connector port, which is the industry standard found on the vast majority of modern RC battery chargers. Check your charger's manual or connector type before ordering if you're unsure. The JST-XH is far more common than older connector types, but it's worth verifying if your charger is several years old.
• What is the difference between JST-XH and other balance connector types? — JST-XH is the modern standard balance connector for 4S LiPo batteries and chargers, adopted by most manufacturers worldwide including Spektrum, Hobbywing, iCharger, SkyRC and many others. Older balance connectors include JST-H and Tamiya, but JST-XH is now the recognised standard. If you already own modern LiPo chargers and batteries, they will almost certainly use JST-XH connectors.
• Will this balance lead work with any 4S battery? — Yes, this extension lead is compatible with any 4S (four-cell) LiPo battery featuring a JST-XH balance connector. This includes 4S batteries for RC cars, boats, aircraft, FPV drones and multirotors. The extension simply sits between your charger's balance port and your battery's balance connector.
• Can I use this for anything other than charging? — Whilst this balance lead is primarily designed for charging applications, it could theoretically be used in other applications requiring JST-XH connectivity, though it is not recommended for powering devices due to the thin gauge of balance lead wiring. Always use dedicated power leads with appropriate gauge for any applications beyond balance monitoring.
• Is this suitable for beginners? — Absolutely. This balance lead extension is ideal for beginners because it simplifies the charging process by providing extra reach, reducing the risk of accidentally placing strain on connectors whilst learning proper charging practices. There is nothing complex about this accessory; simply connect it and you're ready to charge safely.
• How long will this balance lead last? — With proper care, this eTronix balance lead should last for many years. The JST-XH connectors are durable and will handle hundreds of connect-disconnect cycles. Avoid bending the connectors at sharp angles and store the lead in a safe place when not in use to maximise lifespan.
• Will this reduce charging speed? — No. The balance lead extension is designed specifically for balance charging and will not noticeably affect your charging speed or efficiency. It simply extends the distance between charger and battery without impacting the balance charging function.
• What is the wire gauge of this extension lead? — Whilst the source does not specify the exact wire gauge, eTronix manufactures this extension lead with wire gauge appropriate for safe 4S LiPo balance charging current, which is typically quite low (under 1 amp) compared to main battery discharge currents.

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 ETRONIX 4S 30CM BALANCE LEAD EXTENSION WIRE (JST-XH) ET0247 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.