JWM GEN3 LiFePO4 Battery /A123 Emulator McLaren 720S/750S/765LT
All Prices Include VAT
GEN3 LiFePO4 Battery / A123 Emulator – McLaren 720S / 750S / 765LT
Replacement lightweight GEN3 LiFePO4 battery with integrated A123 emulator for McLaren 720S, 750S and 765LT. Eliminates battery faults while delivering significant weight reduction and improved reliability.
Full Product Description
The GEN3 LiFePO4 Battery with Integrated A123 Emulator is a purpose-built solution for McLaren owners seeking reliable lightweight power without triggering OEM battery management errors.
Modern McLaren platforms such as the 720S, 750S and 765LT utilise advanced battery monitoring systems designed around the factory A123 lithium battery. Replacing the OEM unit with a conventional battery often results in error codes, warning lights, or restricted vehicle functionality.
This GEN3 system integrates a fully developed A123 emulator, enabling seamless communication with the vehicle’s battery management system while delivering the performance benefits of a high-output LiFePO4 lithium battery.
The result is a true plug-and-play upgrade offering substantial weight savings, stable voltage delivery, and improved reliability — ideal for road, track, and high-performance applications.
Engineered for consistent output under demanding conditions, the GEN3 battery ensures dependable cold starts, reduced parasitic drain, and full compatibility with McLaren’s sensitive electronics.
An optional JWM Restart Technology variant is also available — effectively incorporating a secondary backup battery within the unit. In the event of partial discharge (common on low-use vehicles), simply press the reset button to restore starting power.
Key Features
- Integrated A123 emulator (no warning lights or system errors)
- Advanced LiFePO4 lithium technology
- Significant weight reduction vs OEM battery
- High output 1500CCA cranking performance
- Optional Restart PowerPlus backup system
- 2-pin direct data connection to McLaren loom
- Plug & play installation – no coding required
- Stable voltage for sensitive McLaren electronics
- Low self-discharge and extended service life
- Suitable for road and track applications
- UK Motorsport MSA registered
Specifications
General
- Product Type: LiFePO4 Lithium Battery
- Generation: GEN3
- Technology: Lithium Iron Phosphate (LiFePO4)
- Emulator: Integrated A123 system emulator
- Installation: Direct replacement
- Application: McLaren 720S / 750S / 765LT
- Data Connection: 2-pin direct to McLaren loom
Electrical Performance
- Nominal Voltage: 14.4V
- Main Battery Capacity: 80Ah (Lithium)
- Main Battery CCA: 1500CCA
- Reserve Battery Capacity: 6Ah (Lithium)
- Reserve Battery CCA: 400CCA
Dimensions
- Size (L x W x H): 278 x 175 x 188 mm
Weight
- Standard 80Ah Battery: 8.0kg
- Restart PowerPlus 80Ah: 8.9kg
Compatible Vehicles
McLaren Super Series / LT Models
- McLaren 720S Coupe
- McLaren 720S Spider
- McLaren 750S Coupe
- McLaren 750S Spider
- McLaren 765LT Coupe
- McLaren 765LT Spider
Why Upgrade to GEN3 LiFePO4?
McLaren’s factory A123 battery system is highly sensitive to voltage behaviour and communication signals. This GEN3 solution replicates OEM functionality while delivering the advantages of modern lithium battery technology.
The result is a lighter, more reliable and fault-free system, eliminating common issues such as battery warnings, charging faults, and parasitic drain problems.
For performance builds where every kilogram matters, this upgrade delivers a critical improvement in both reliability and efficiency.
Important Notes
- Designed specifically for vehicles originally equipped with A123 battery systems
- Not compatible with vehicles requiring coding for non-emulated batteries
- Professional installation recommended
We offer professional installation services directly in the Rennworks workshop, where your product will be expertly fitted and fully set up for optimal performance. To book an installation appointment, simply contact us and we’ll be happy to arrange a time that suits you.
Not sure if this product is the right fit for your vehicle? We’re here to help. Our team can quickly check compatibility and make sure you’re choosing the correct item before you buy. Just reach out with your vehicle details, and we’ll confirm everything for you.
Some product images are for illustrative purposes only and may show a generic or representative version of the item. Actual components may vary slightly depending on vehicle application or specification, but all products supplied will match the description and meet our quality standards.
Most orders are processed within 1–2 business days and usually ship within 3–7 business days. Not all items are held in stock, as some products are bespoke and made to order — for example, certain coilover suspension kits and exhaust systems — and delivery times may be longer in these cases. Where this applies, we’ll keep you fully informed and confirm expected dispatch dates as soon as possible. If you’d like to check availability or lead times, feel free to contact us before making a purchase.