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Kronobat SD-45.1T · Car battery 12V 45Ah 300A

Specifications

BrandKRONOBAT
Part numberSD-45.1T
Voltage (V)12
Capacity (C20)45Ah (c20)
Cold cranking amps (EN)300A
TechnologyLead-acid
Length219.00 cm
Width135.00 cm
Height225.00 cm
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Polarity: positive on the left. Check it matches your current battery before buying.

Kronobat SD-45.1T 12V 45Ah 300A is a ready-to-use passenger car battery, sealed and maintenance-free. Delivers the cranking amps the engine needs in cold weather and keeps stable voltage for modern car loads (ECU, sensors, climate control, infotainment).

Why this car battery?

  • Original-equipment qualitywithout dealership prices
  • Lasts 4 to 6 yearsbuy once instead of twice
  • Real human tech supportif you have any doubts before buying
Voltage
12 V
Capacity
45 Ah C20
Cold cranking
300 A EN-1
Dimensions
219×135×225 mm
Technology
Lead-acid
Polarity
Positive on the left
Weight
10,8 kg
Model
STANDARD
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Car battery Kronobat SD-45.1T Standard 45Ah 300A 12V

12VVoltage
45AhCapacity
300ACold cranking
10.80kgWeight

The Kronobat SD-45.1T from the Standard range delivers 45 Ah and 300 A of cold cranking current (EN) at 12 V: the usual specification for passenger cars with conventional starting, without a Start-Stop system. It replaces the original battery without adaptation in cars with a 219 × 135 × 225 mm format: same 45 Ah capacity and the positive terminal on the left.

In short: the Kronobat SD-45.1T (45 Ah, 300 A, 219 × 135 × 225 mm, positive terminal on the left). It is a conventional battery for cars without Start-Stop: if yours has Start-Stop, it needs an EFB or AGM battery of the same size. Verified equivalent alternatives: Varta B24 and Tudor TB451.

  • Conventional lead-acid: the most proven and economical technology.
  • Reliable cold starts, even after weeks without driving.
  • Direct replacement for the original battery in size and terminals.
  • Original-equipment build quality without the dealership price.

What the Kronobat SD-45.1T is for

Designed for passenger cars with conventional starting, without a Start-Stop system, the Kronobat SD-45.1T is the direct replacement when your vehicle uses a 45 Ah battery of this format. Before buying, compare dimensions, terminals and capacity with the battery you are replacing. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 10.80 kg and 1.0 terminals.

The Kronobat SD-45.1T: Standard range and conventional lead-acid technology

The SD-45.1T is part of the Kronobat Standard range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family.

In a conventional battery the electrolyte is liquid and the lead plates are immersed in it. It is a mature, economical and easily recycled technology, ideal for starting vehicles in normal use.

Will it fit your current battery tray?

It has external dimensions of 219 × 135 × 225 mm and weighs 10.80 kg. The positive terminal on the left decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses 1.0 terminals, the system that anchors and connects it in the vehicle. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery.

Kronobat: the maker behind the SD-45.1T

Kronobat is the exclusive brand of baterias.com: batteries made to the same production standards as the leading brands, with a value for money that is hard to match and an official warranty. We guarantee that every Kronobat arrives new, charged and with the manufacturer's full warranty.

How to make it last longer

On batteries with filler caps, check the electrolyte level and top up only with distilled water. In normal daily use the alternator keeps the battery charged; if the car stands for weeks, a maintenance charge once a month prevents deep discharge.

Manufacturer's warranty

The Kronobat SD-45.1T comes with the manufacturer's official warranty against manufacturing defects; the exact period is stated in the brand's conditions. If it fails through a defect within the period, we replace it free of charge.

When you get it and how to return it

Orders placed before 6:00 pm with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic Islands and the rest of the European Union allow 3 to 5 working days. You have 14 days to return an unused battery; in mainland Spain and Portugal collection is free. We email you the tracking number as soon as the parcel ships.

  • Reference
    BCOM-KRONOBAT-SD-45.1T

Data sheet

  • Brand
  • Reference
    SD-45.1T
  • Model
    STANDARD
  • Voltage (V)
    12
  • Length
    219.00 cm
  • Width
    135.00 cm
  • Height
    225.00 cm
  • Weight
    10.80 Kgs
  • Technology
    Lead-acid
  • Terminal layout
    Positive terminal on the left
  • Terminal type
    1.0
  • Cold cranking amps (EN)
    300A
  • Capacity (C20)
    45Ah (c20)

Specific References

  • MPN
    SD-45.1T

Comparison: Kronobat SD-45.1T vs equivalents — alternatives with the same dimensions, Ah and CCA

The Kronobat SD-45.1T is interchangeable with these equivalent references: B24 (Varta), TB451 (Tudor), EB451 (Exide).

Product Specifications Technology Price
Kronobat SD-45.1T Kronobat SD-45.1T This battery 12V 45Ah 300A Lead-acid
Varta B24 Varta B24 12V 45Ah 300A Lead-acid €81.40
Tudor TB451 Tudor TB451 12V 45Ah 330A Lead-acid €66.20
Exide EB451 Exide EB451 12V 45Ah 330A Lead-acid €59.95

Equivalences verified by our technical team: same dimensions, polarity, capacity and CCA. Official manufacturer warranty on every option.

Recommended accessories — complement the Kronobat SD-45.1T with a charger or tester

Fitting it yourself? Step-by-step guide to replacing the battery →

Frequently asked questions

How do I fit the SD-45.1T model in my car?

In most cars it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on our blog. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — with positive on the left match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.

What is the service life of the SD-45.1T model?

Expected lifespan of the Kronobat SD-45.1T is 4 to 6 years in regular car use without Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured.

What are the measurements of the SD-45.1T model?

Dimensions (length × width × height) are 219×135×225 mm — also written as 219x135x225 mm — following the European DIN standard. Always measure the space in your car before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals.

What polarity does the Kronobat SD-45.1T battery have?

Polarity: positive on the left. To identify it, place the battery in front of you with the terminals facing you and check which side the positive (+, marked with a red ring) is on. Before buying, verify the polarity matches your current battery: switching polarity forces longer cables or system reconfiguration, with short-circuit risk.

Will the Kronobat SD-45.1T battery fit my car?

Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The SD-45.1T typically fits a wide range of European vehicles thanks to its standard DIN case format.

Which batteries are equivalent to the Kronobat SD-45.1T?

Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop cars. See the "Equivalents" section to view recommended options at the same performance level.


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