POPULAR CATEGORY
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £19.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £19.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £7.99 | 3 to 5 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £7.99 | 5 to 7 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £7.99 | 7 to 10 working days |
Vintage and classic commercial vehicles place particular demands on their electrical systems, requiring a battery that delivers reliable cranking performance at a nominal 6V – a specification that modern replacements rarely satisfy. The Numax 521 is a dedicated 6V lead-acid battery engineered specifically for heritage commercial vehicles, agricultural machinery, and classic plant equipment where period-correct voltage architecture must be maintained.
Numax batteries are constructed to exacting specifications under the Numax Commercial Classic CV range, prioritising consistent cold-weather starting performance and a robust service life in demanding operating environments. The NUMAX CLASSIC CV platform is built to accommodate the elevated electrical demands placed on vintage powertrains, where electrical tolerances are tighter and sourcing suitable replacements can present a significant challenge.
The Numax 521 delivers 112Ah capacity (C20 rating) and 390A Cold Cranking Amps (EN), housed in a case measuring 291mm × 173mm – 221mm (L × W × H) and weighing 22.4kg. It features a Type 1 terminal configuration with Polarity 0 (positive on the left) and B00 hold-down arrangement. No direct cross-reference is listed; buyers should verify fitment against original equipment specifications before ordering. Start-stop compatibility is not confirmed – refer to the product label." This product is available in a range of related Numax Commercial variants to suit alternative fitment requirements across the classic and vintage vehicle sector. "The Numax 521 is supplied with a 1 Year Warranty, covering manufacturing defects and supporting reliable performance throughout its service life.
Delivery: pallet shipment, typically 3–5 working days within UK mainland. Contact PartsForMachines for delivery quote. 30-day returns.
Quality, durability and performance sum up the NUMAX range of batteries. NUMAX batteries are built to the very highest specification to cope with today’s automotive electrical demands. The NUMAX automotive range has a battery to suit every application whilst providing premium quality and value. That’s why people trust the NUMAX battery brand to give them the performance they need no matter how harsh the conditions.
Key Feature:Developed by Numax as a 6.0 1 battery, offering stable energy output, dependable starting power, and compatibility across general automotive and light commercial applications.
Uses:PartsForMachines is a premier e-commerce platform, founded in 2019 in Warwickshire, UK, specialising in aftermarket parts and services for construction, agriculture, and industrial machinery. We offer an extensive catalogue of over 500,000 products. Standard delivery: 1–3 working days within UK mainland. We are proud to be an authorised distributor, giving customers extra confidence when purchasing genuine products from us. In addition, we provide a 30-day return policy for eligible items.
Fitment Warning:You must check your current battery against the specifications of this battery before ordering to ensure that this is the correct battery for your vehicle. Check battery technology, dimensions, terminal type, polarity, capacity (AH) and cranking performance (CCA). We cannot guarantee correct fitment under any circumstances.
| Brand | Numax Batteries |
|---|---|
| Voltage | 6V |
| Capacity AH (C20) | 112Ah |
| Cold Cranking Amps (EN) | 390A |
| L × W × H | 291mm × 173mm × 221mm |
| Warranty period | 1 Year |
| Weight (Kg) | 22.4 |
| Capacity AH (C5) | |
| Capacity AH (C10) | |
| Capacity AH (C100) | |
| Marine Cranking Amps (MCA) | |
| Watt-Hours (WH) | |
| Length (mm) | 291 |
| Width (mm) | 173 |
| Height Inc. Terminal (mm) | 221 |
| Terminal Placement | 0 |
| Terminal Type | 1 |
| Hold Down | B00 |
| Case Size | |
| ETN Number | |
| TTNR |
| Engine Parts | Product Number | Product Name | Recommended Units | Product Price |
|---|
Expert Guidelines for Preserving Your Heavy Equipment Battery Heavy machinery, including forklifts, bulldozers, and excavators, relies on robust batteries to minimize downtime and maximize operational availability. These batteries must endure even more challenging conditions than typical automotive batteries. Moreover,...
Standard Delivery: £7.99
Delivery Estimate: 3 to 5 working days
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| Technical Specification | ||||
|---|---|---|---|---|
| PRODUCT NUMBER | YBX1019 | YBX1616 | YBX1663 | YBX1664 |
| Voltage | 12 | 12 | 12 | 12 |
| Capacity (AH) | 90 | 110 | 110 | 110 |
| Hold Down | B13 | N | N | N |
| Cold Cranking Amps (EN1) | 800 | 680 | 750 | 750 |
| Terminal Type | T1 | T1 | T1 | T1 |
| Cell Layout | 0 | 0 | 0 | 1 |
| Length | 353 | 407 | 347 | 347 |
| Width | 175 | 176 | 174 | 174 |
| Height | 190 | 234 | 235 | 235 |
| Show More | ||||
A. The Numax 521 is a 6V battery, designed for vintage and classic commercial vehicles, agricultural machinery, and heritage plant equipment that operate on a 6-volt electrical system rather than the 12V standard found in modern vehicles.
A. The Numax 521 offers a capacity of 112Ah at the C20 rate and delivers 390 Cold Cranking Amps (CCA) to the EN standard, providing dependable starting performance in cold operating conditions.
A. The battery measures 291mm in length, 173mm in width, and 221mm in height including the terminal. It weighs 22.4kg. Always confirm these measurements against your battery tray and available clearance before ordering.
A. The Numax 521 uses a Type 1 terminal configuration with Polarity 0, meaning the positive terminal is positioned on the left-hand side when facing the battery. The hold-down arrangement is B00. Verify these details against your vehicle's original specification before fitting.
A. Start-stop compatibility for the Numax 521 is not confirmed. Please refer to the product label supplied with the battery for guidance, and consult your vehicle manufacturer's specification if your application involves stop-start functionality.
A. No direct cross-reference numbers are listed for the Numax 521. It is recommended that buyers verify fitment by matching the voltage (6V), capacity (112Ah), CCA (390A), and physical dimensions against their original equipment or existing battery specification.
A. The Numax 521 is intended for vintage and classic commercial vehicles, heritage agricultural machinery, and classic plant equipment that require a 6V battery. It is part of the Numax CLASSIC CV range, engineered for period-correct electrical systems where modern 12V batteries are not compatible.
A. The Numax 521 is supplied with a 1 Year Warranty covering manufacturing defects and supporting reliable service performance. For warranty claims or queries, contact PartsForMachines directly.
A. Delivery: pallet shipment, typically 3–5 working days within UK mainland. Contact PartsForMachines for delivery quote. 30-day returns.
A. Yes. Related Numax Commercial variants include the 249H, 250H, 643, 663, 664, 665, 616R, 663H, S637, and 616L. Similar batteries from the YBX1 range — including the YBX1019, YBX1616, YBX1643, YBX1663, and YBX1664 — may also be relevant depending on your application.
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