Key Features
- Built-in cell balancer
- Built-in safety current prevents overcharging
Overview
The 4000 2S LiPo offers not only double the flight time as the stock DX8 battery but also advanced safety and features. It also includes a built-in safety current that shuts the battery off, to avoid overcharging and damaging the battery and radio. Plus, a built-in balancing system to make sure you get the longest life and power from your pack.
- Brand: Spektrum
- Model Number: SPMB4000LPTX
- Battery Type: LiPo (Lithium Polymer)
- Nominal Voltage: 7.4V
- Capacity: 4000mAh
- Cell Configuration: 2S1P (2 cells in series, 1 cell in parallel)
- Voltage Per Cell: 3.7V
- Number of Cells: 2
- Connector Type: White TX Plug (Spektrum transmitter connector)
- Charge Protection Circuitry: Yes (built-in)
- Cell Balancer: Yes (built-in)
- Safety Current Protection: Yes (prevents overcharging)
- Wire Gauge: 20 AWG
- Product Length: 2.05 inches (52 mm)
- Product Width: 2.68 inches (68 mm)
- Product Height: 0.75 inches (19 mm)
- Product Weight: 5.04 ounces (143 grams)
- Compatible Transmitters: DX9, DX9 Black Edition, DX8, DX8 Gen 1, DX7S, DX20
Overview
The Spektrum 7.4V 4000mAh 2S LiPo Transmitter Battery is the ultimate power solution for RC enthusiasts across the UK who demand extended runtime and advanced safety features in their transmitters. Designed specifically for the popular DX8 and DX9 radio systems, this premium lithium polymer battery delivers double the flight time of stock transmitter batteries, making it an essential upgrade for serious RC car UK operators and competitive pilots who refuse to compromise on control reliability. Whether you're piloting a ready to run RC car or managing complex racing scenarios, this battery ensures your transmitter stays powered throughout your entire session without the worry of mid-flight power loss.
Built with cutting-edge battery technology, this 4000mAh capacity pack represents a significant advancement in transmitter power solutions for the UK RC hobby market. The battery combines impressive capacity with intelligent charging protection and cell balancing systems that work together to maximise lifespan and performance. This means you'll enjoy consistently strong transmitter response and range, session after session, making it an investment that pays dividends in reliability and control precision for any RC enthusiast.
RC Model Shop stocks this genuine Spektrum battery as an authorised dealer, ensuring you receive a product backed by full manufacturer warranty and authentic specifications. Whether you're upgrading your brushless RC car or want to extend your transmitter's operating life on the track, this 4000mAh LiPo transmitter battery is the professional choice trusted by RC competitors and weekend bashers alike across the UK.
Key Features
- Built-in Cell Balancer — This intelligent balancing system automatically ensures each cell within the 2S battery pack maintains optimal voltage levels during charging and discharging, which directly extends the overall lifespan of the battery and maintains consistent power delivery to your DX8 or DX9 transmitter throughout your flying or racing session.
- Built-in Safety Current Protection — The integrated charge protection circuitry monitors current flow and automatically shuts off the battery before overcharging can occur, preventing potential damage to both the battery itself and your expensive Spektrum radio system, giving you complete peace of mind during charging cycles.
- 7.4V 2S LiPo Configuration — Delivering 3.7 volts per cell across two cells in series, this voltage configuration is specifically optimised for Spektrum DX-series transmitter systems, providing the perfect balance of power output and runtime for extended control sessions.
- 4000mAh High Capacity — The substantial 4000mAh capacity offers significantly extended transmitter runtime compared to stock batteries, meaning fewer interruptions to your RC sessions and more time to enjoy your hobby without constant recharging requirements.
- White TX Plug Connector — This standardised Spektrum transmitter connector ensures seamless compatibility with DX8, DX9, DX9 Black Edition, DX8 Gen 1, DX7S, and DX20 radio systems, with no adapter required for straightforward installation and use.
Technical Performance
The Spektrum 4000mAh LiPo transmitter battery represents professional-grade engineering specifically tailored for demanding RC applications across the UK. With its 7.4V nominal voltage (delivering 3.7V per cell in a 2S1P configuration), this battery pack delivers consistent power output that maintains transmitter performance and communication range throughout extended flying or racing sessions. The compact dimensions of 52mm length, 68mm width, and 19mm height ensure the battery fits seamlessly into DX8 and DX9 transmitter battery compartments without modification, whilst the lightweight 143-gram mass preserves the ergonomic handling characteristics of your radio system. The 20 AWG wire gauge provides optimal current delivery without excessive voltage drop, supporting the demands of modern digital servo systems and advanced receiver protocols. The genuine LiPo chemistry delivers superior power density compared to older NiMH and NiCd battery technologies, making this the preferred choice for competitive RC car UK racing and serious hobbyists who demand cutting-edge transmitter performance. The integrated charge protection circuitry and cell balancer work in concert to safeguard your investment, preventing the common issues of cell imbalance and overcharging that plague inferior battery solutions.
What's in the Box
- Spektrum 7.4V 4000mAh 2S LiPo Transmitter Battery (SPMB4000LPTX)
- White TX Plug connector pre-installed
Frequently Asked Questions
- Is this 4000mAh LiPo transmitter battery compatible with my Spektrum DX9 radio? — Yes, absolutely. This battery is specifically designed for the DX9 and DX9 Black Edition transmitter systems, and it's also fully compatible with the DX8, DX8 Gen 1, DX7S, and DX20 models. The white TX plug connector is the standard Spektrum transmitter connector, so it fits directly into your radio without any adapters or modifications required.
- How much longer will my transmitter run compared to the stock battery? — The existing product information indicates this 4000mAh battery offers double the flight time compared to the original stock DX8 battery, meaning you'll enjoy significantly extended operating time between charging sessions, allowing for much longer uninterrupted RC sessions.
- What voltage does this transmitter battery provide? — This is a 7.4V nominal battery, specifically a 2-cell LiPo (2S) configuration that delivers 3.7 volts per cell. This voltage is optimised precisely for Spektrum DX-series radio systems and should never be used with radio systems designed for different voltage ranges.
- Does this battery have overcharge protection? — Yes, this battery includes built-in charge protection circuitry featuring a built-in safety current that automatically shuts the battery off before overcharging can occur, protecting both your battery and your expensive Spektrum transmitter from damage caused by overvoltage.
- What is the cell balancer and why do I need it? — The integrated cell balancer automatically monitors and maintains equal voltage levels between the two cells in the 2S configuration during charging and discharge. This ensures maximum lifespan, consistent power output, and prevents cell damage that can occur when one cell discharges or charges faster than the other.
- How much does this transmitter battery weigh? — The battery weighs 143 grams (5.04 ounces), making it a lightweight addition to your transmitter that won't noticeably impact the balance or handling of your DX8 or DX9 radio during extended flying or racing sessions.
- Is the 4000mAh capacity a significant upgrade? — Yes, the 4000mAh capacity represents a substantial upgrade from stock transmitter batteries, providing double the energy storage and, by extension, double the operating time before you need to recharge, making it an essential upgrade for competitive RC car UK operators and serious hobbyists.
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 4000mAh LiPo Transmitter Battery: DX8, DX9 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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