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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 | £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 |
Product Number: 85B24LS
Variations
Click on the button below to find the right battery for your machine
Battery FinderTesla Model 3 vehicles rely on a dedicated 12V auxiliary battery to power essential low-voltage systems independently of the high-voltage traction pack. When this battery degrades, critical functions including door locks, lighting, climate controls, and the central touchscreen can fail — and in some cases the vehicle will not wake or restart. The 85B24LS is the lead-acid auxiliary battery Tesla names in its Model 3 service documentation as the correct low-voltage replacement.
This Atlas-brand 85B24LS matches the original-fitment specification (Tesla part number 1129182-00-B) supplied by AtlasBX / Hankook. It is a deep-cycle flooded lead-acid battery built for the heavy charge/discharge cycling characteristic of Tesla's 12V system, where the DC-DC converter tops the battery up repeatedly even while the car is parked. It operates at 12V with 50Ah capacity at the C20 rate and is a like-for-like replacement requiring no modification.
The battery uses a B24 case measuring 234mm × 127mm × 220mm (L × W × H) and weighs 12kg. Terminal placement is Type 1 with polarity code 0 (positive terminal on the left). Hold-down configuration is B00. CCA, MCA and Watt-Hour figures are not applicable to this auxiliary, deep-cycle role and are not published for this battery.
This battery is backed by a 1-year manufacturer warranty covering defects in materials and workmanship under normal operating conditions. Standard delivery: 1–3 working days within UK mainland. 30-day returns.
Why a Tesla 12V auxiliary battery mattersTesla vehicles carry a 12V battery to power low-voltage systems such as lighting, door locks, climate controls and the touchscreen. This keeps these systems available even when the high-voltage pack is disconnected, and lets Tesla use standardised 12V components. Because the Model 3 cycles this battery far more frequently than a conventional ICE vehicle, fitting a generic starter battery typically results in failure within months — which is why Tesla's own service documentation directs owners to replace it with the same-type 85B24LS.
Key Features:This battery fits Tesla Model 3 vehicles built before 2022, which were factory-equipped with a lead-acid 12V battery. Model 3s built 2022 onwards use a lithium-ion auxiliary battery and require a different replacement. Please verify which type your vehicle has before ordering.
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 | Atlas |
|---|---|
| Voltage | 12V |
| Capacity AH (C20) | 50Ah |
| Cold Cranking Amps (EN) | |
| L × W × H | 234mm × 127mm × 220mm |
| Warranty period | 1 Year |
| Weight (Kg) | 12 |
| Capacity AH (C5) | |
| Capacity AH (C10) | |
| Capacity AH (C100) | |
| Marine Cranking Amps (MCA) | |
| Watt-Hours (WH) | |
| Length (mm) | 234 |
| Width (mm) | 127 |
| Height Inc. Terminal (mm) | 220 |
| Terminal Placement | 0 |
| Terminal Type | 1 |
| Hold Down | B00 |
| Case Size | B24 |
| ETN Number | |
| TTNR |
| Engine Parts | Product Number | Product Name | Recommended Units | Product Price |
|---|
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| Technical Specification | |||||
|---|---|---|---|---|---|
| PRODUCT NUMBER | S4000 | S4001 | S4018 | S4019 | S4020 |
| Voltage | 12 | 12 | 12 | 12 | 12 |
| Capacity (AH) | 44 | 44 | 40 | 40 | 45 |
| Cold Cranking Amps (EN1) | 420 | 440 | 330 | 330 | 330 |
| Terminal Type | 1 | 1 | 3 | 3 | 3 |
| Length | 175 | 207 | 187 | 187 | 238 |
| Width | 175 | 175 | 127 | 127 | 129 |
| Height | 190 | 175 | 227 | 227 | 227 |
| Show More | |||||
A. The 85B24LS is the 12V auxiliary battery Tesla specifies for the Model 3. It powers door locks, lighting, touchscreen, climate controls, and safety electronics independently of the main traction pack.
A. Yes. Tesla's official Model 3 service documentation names the AtlasBX / Hankook 85B24LS 12V 50Ah as the correct low-voltage replacement. Our Atlas-brand battery matches that specification.
A. This battery fits Model 3 vehicles built before 2022, which were factory-equipped with a lead-acid 12V battery. Model 3s built 2022 onwards use a lithium-ion battery instead.
A. The OEM cross-reference is 85B24LS, matching Tesla part number 1129182-00-B — the battery Tesla's Model 3 service documentation names as the correct low-voltage replacement.
A. 12V with 50Ah capacity at the C20 discharge rate — matching Tesla's specification for the Model 3 low-voltage battery. CCA and Watt-Hour ratings are not applicable to this auxiliary role.
A. A generic starter battery isn't built for Tesla's heavy 12V cycling and typically fails within months, often triggering dashboard messages such as "Schedule service to replace low voltage battery".
A. Tesla's service documentation directs Model 3 owners to replace the low-voltage battery with the same-type 85B24LS. Fitting our Atlas-brand 85B24LS follows that published guidance with a like-for-like specification.
A. Tesla's DC-DC converter cycles the 12V battery repeatedly even when parked — far more than an ICE vehicle. This deep-cycle duty demands a battery built for the role, like the 85B24LS.
A. A 30-day returns policy applies.
A. This is a lead acid battery, purpose-built for the auxiliary low-voltage role in Tesla vehicles. It is not a lithium-ion battery.
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