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| 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 | £5.99 | 3 to 5 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £5.99 | 5 to 7 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £5.99 | 7 to 10 working days |
Reliable cold-weather starting performance is a fundamental requirement for any conventional petrol or diesel vehicle, yet ageing or undersized batteries frequently fail to deliver adequate cranking power. The Bosch S4021 is a 12V 45Ah lead-acid starter battery engineered to meet that demand, offering 330A cold cranking amps (EN) and consistent power delivery across a wide range of operating conditions.
Manufactured to Bosch's S4 series specification, the S4021 uses full frame grid technology to maximise active material utilisation and extend service life. Flushed battery covers minimise the risk of acid leakage during handling and installation, whilst robust carry handles support safe transportation. The design is built in accordance with OEM requirements, ensuring dependable performance equivalent to factory-fit standards.
The S4021 measures 238mm (L) × 129mm (W) × 227mm (H inc. terminal), weighs 11.43kg, and is supplied with a Type 0 (positive right) terminal polarity and B00 hold-down configuration. It is a direct replacement for Type 048 and Type 053 applications. Bosch part cross-reference: 545156033. This battery is not suitable for start-stop vehicles.
This product is one of ten variants in the Bosch S4 range stocked by PartsForMachines, covering a broad spread of capacities and fitments. Related SKUs include S4000, S4001, S4002, S4004, S4005, S4018, S4019, S4020, S4022, and S4023.
The S4021 is backed by a 4-year manufacturer warranty, providing long-term assurance for trade and retail buyers alike.
Standard delivery: 1–3 working days within UK mainland. 30-day returns.
The Bosch S4 Battery ensures a powerful start for all types of vehicles and offers long service life, flushed tops for minimized risk of acid leakage, and dependable power in accordance with OEM requirements. It uses full frame grid technology, highly protective pocket separators and robust connections inside to extend lifetime and maximize reliability.
Key Feature:Suited for passenger cars, balancing reliable cold-cranking performance with long service life for daily use.
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 | Bosch |
|---|---|
| Voltage | 12V |
| Capacity AH (C20) | 45Ah |
| Cold Cranking Amps (EN) | 330A |
| L × W × H | 238mm × 129mm × 227mm |
| Warranty period | 4 Years |
| Weight (Kg) | 11.43 |
| Capacity AH (C5) | |
| Capacity AH (C10) | |
| Capacity AH (C100) | |
| Marine Cranking Amps (MCA) | |
| Watt-Hours (WH) | |
| Length (mm) | 238 |
| Width (mm) | 129 |
| Height Inc. Terminal (mm) | 227 |
| Terminal Placement | 0 |
| Terminal Type | 1 |
| Hold Down | B00 |
| Case Size | |
| ETN Number | 545156033 |
| TTNR | 0092S40210 |
| 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: £5.99
Delivery Estimate: 3 to 5 working days
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| Technical Specification | |||||
|---|---|---|---|---|---|
| PRODUCT NUMBER | YBX1012 | YBX1063 | YBX1049 | EA406 | EA456 |
| Voltage | 12 | 12 | 12 | 12 | 12 |
| Capacity (AH) | 45 | 40 | 45 | 40 | 45 |
| Hold Down | B3 | B13 | B1 | ||
| Cold Cranking Amps (EN1) | 380 | 360 | 350 | 350 | 390 |
| Terminal Type | T1 | T1 | T1 | ||
| Cell Layout | 0 | 0 | 1 | ||
| Length | 207 | 207 | 220 | 187 | 237 |
| Width | 175 | 175 | 135 | 127 | 127 |
| Height | 190 | 175 | 225 | 220 | 227 |
| Show More | |||||
A. The Bosch S4021 has a cold cranking amp (CCA) rating of 330A measured to the EN standard, making it suitable for reliable cold-weather starting in conventional petrol and diesel vehicles.
A. The Bosch S4021 measures 238mm in length, 129mm in width, and 227mm in height including the terminal. It weighs 11.43kg. Always verify fitment against your vehicle's battery tray dimensions before ordering.
A. The Bosch S4021 is a direct replacement for Type 048 and Type 053 batteries. The Bosch cross-reference number is 545156033.
A. The S4021 uses Terminal Type 1 with a polarity designation of 0, meaning the positive terminal is positioned on the right-hand side when viewed from the front. The hold-down type is B00.
A. No. The Bosch S4021 is a standard lead-acid battery and is not suitable for vehicles fitted with start-stop systems. For start-stop applications, an AGM or EFB battery of the appropriate specification is required.
A. The Bosch S4021 is covered by a 4-year manufacturer warranty. This provides assurance of dependable performance over an extended service period for both trade and retail purchasers.
A. The S4021 operates at 12V with a rated capacity of 45Ah (C20). This makes it appropriate for a range of small to mid-sized conventional petrol and diesel passenger vehicles.
A. The Bosch S4 series uses full frame grid technology, which maximises the utilisation of active battery material to deliver a longer service life and consistent power output. The flushed battery top design also reduces the risk of acid leakage.
A. Yes. PartsForMachines stocks ten additional Bosch S4 variants alongside the S4021, including the S4000, S4001, S4002, S4004, S4005, S4018, S4019, S4020, S4022, and S4023, covering a range of capacities and fitment specifications.
A. The Bosch S4021 is dispatched via standard parcel delivery and arrives within 1–3 working days to UK mainland addresses. A 30-day returns policy applies. For remote or non-mainland locations, delivery timescales may vary.
A. A 30-day returns policy applies.
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