Kronobat SD-45.1 · Car battery 45Ah 400A
Specifications
| Brand | KRONOBAT |
|---|---|
| Part number | SD-45.1 |
| Voltage (V) | 12 |
| Capacity (C20) | 45Ah (c20) |
| Cold cranking amps (EN) | 400A |
| Technology | Lead-acid |
| Length | 207 mm |
| Width | 175 mm |
| Height | 190 mm |
Kronobat SD-45.1 12V 45Ah 400A is a passenger car battery with factory-guaranteed cranking power and extended service life. OEM quality at white-label prices: calcium-silver grids, low self-discharge and compatible with all modern electrical systems.
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
Where it fits: the Kronobat SD-45.1 is one of our car batteries, belongs to our Kronobat batteries and by capacity it sits among our 45Ah batteries.
The Kronobat SD-45.1 in practice
SD-45.1 vs Kronobat PB-52.0
The Kronobat SD-45.1 offers 45 Ah and 400 A cold cranking in a 207 × 175 × 190 mm case. The Kronobat PB-52.0, same brand and technology, goes up to 52 Ah and 470 A and costs €9.20 more. Going up is only worth it if the tray allows it and the car cranks lazily in the cold; in normal use this one is plenty.
When not to choose it
It is a conventional battery: not for Start-Stop cars, which need EFB or AGM depending on what they left the factory with. Never go below the original capacity and cranking either.

Car battery Kronobat SD-45.1 Standard 45Ah 400A 12V
The Kronobat SD-45.1 from the Standard range delivers 45 Ah and 400 A of cold cranking current (EN) at 12 V: the usual specification for passenger cars with conventional starting, without a Start-Stop system. Its 207 × 175 × 190 mm and the positive terminal on the left make it the exact replacement for the 45 Ah battery fitted as standard to many cars.
In short: the Kronobat SD-45.1 (45 Ah, 400 A, 207 × 175 × 190 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.
- Designed to last several years under normal daily use.
- Low self-discharge: copes with long stops without losing charge.
- Stable voltage for the vehicle electronics (ECU, sensors, climate control).
- Good balance of capacity, cranking power and price.
What the Kronobat SD-45.1 is for
The Kronobat SD-45.1 covers the needs of passenger cars with conventional starting, without a Start-Stop system: reliable starting, stable voltage for the electronics and a service life of several years in daily use. Check that it matches your current battery in size and terminal position. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 11.70 kg and 1.0 terminals.
The Kronobat SD-45.1: Standard range and conventional lead-acid technology
Within the Kronobat catalogue, the Standard series groups the references designed for this use. The SD-45.1 is the 45 Ah model of that family, with the same performance as its siblings in other sizes.
Conventional lead-acid is the benchmark against which other technologies are compared: good cranking current, great tolerance to alternator charging and the best price per amp-hour.
Dimensions, polarity and mounting
It has external dimensions of 207 × 175 × 190 mm and weighs 11.70 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.
What Kronobat does differently
With Kronobat we offer an own-brand alternative without compromising on quality: European manufacturing, original-equipment controls and the direct backing of baterias.com for warranty and advice. We guarantee that every Kronobat arrives new, charged and with the manufacturer's full warranty.
How to make it last longer
Avoid leaving lights or accessories on with the engine off: most batteries fail not through defects but through repeated deep discharges. On batteries with filler caps, check the electrolyte level and top up only with distilled water.
Warranty and coverage
The Kronobat SD-45.1 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
Order before 6:00 pm with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have 14 days to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email.
Data sheet
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ReferenceSD-45.1
-
ModelSTANDARD
-
Voltage (V)12
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Length207 mm
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Width175 mm
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Height190 mm
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Weight11.70 Kgs
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TechnologyLead-acid
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Terminal layoutPositive terminal on the left
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Terminal type1.0
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Cold cranking amps (EN)400A
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Capacity (C20)45Ah (c20)
Specific References
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MPNSD-45.1
Kronobat SD-45.1: alternatives with the same dimensions
Batteries from our catalogue with the same dimensions, voltage and technology as the Kronobat SD-45.1 and a similar capacity, sorted by sales. They are not manufacturer-approved equivalents: check the polarity and capacity of your original battery.
| Product | Specifications | Technology | Price | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Kronobat
SD-45.1
This battery
|
12V 45Ah 400A | Lead-acid | 49,70 € | |||||||||||||||||||||
Varta
A9
Upgrade: AGM
|
12V 50Ah 540A | AGM Upgrade | 118,90 € +69,20 € | |||||||||||||||||||||
| ||||||||||||||||||||||||
| SD-45.1 | A9 | |
|---|---|---|
| Capacity | 45 Ah | 50 Ah |
| Cold cranking (EN) | 400 A | 540 A |
| Technology | Lead-acid | AGM |
| Dimensions (mm) | 207 × 175 × 190 | 207 × 175 × 190 |
| Positive terminal | Positive terminal on the left | Positive terminal on the right |
| Price | 49,70 € | 118,90 € |
Varta
N50
Upgrade: EFB
Kronobat SD-45.1 vs Varta N50
Upgrade: EFB · +36,10 €
The EFB of this size, built for the simple Start-Stop that a conventional battery like the SD-45.1 cannot take. Compared with the SD-45.1 it has 5 Ah more and 150 A of cold cranking more. It costs 36,10 € more. Essential if your car has basic Start-Stop or came with EFB; without Start-Stop it is a durability upgrade you can skip.
| SD-45.1 | N50 | |
|---|---|---|
| Capacity | 45 Ah | 50 Ah |
| Cold cranking (EN) | 400 A | 550 A |
| Technology | Lead-acid | EFB |
| Dimensions (mm) | 207 × 175 × 190 | 207 × 175 × 190 |
| Positive terminal | Positive terminal on the left | Positive terminal on the right |
| Price | 49,70 € | 85,80 € |
Varta
B20
Same size
Kronobat SD-45.1 vs Varta B20
Same size · +1,10 €
It has the same dimensions, voltage and technology as the SD-45.1, although it is not a manufacturer-approved equivalent. Compared with the SD-45.1 it has the same Ah and cranking power. It costs 1,10 € more. Check the positive terminal side and the original capacity before ordering; otherwise it is a straight swap.
| SD-45.1 | B20 | |
|---|---|---|
| Capacity | 45 Ah | 45 Ah |
| Cold cranking (EN) | 400 A | 400 A |
| Technology | Lead-acid | Lead-acid |
| Dimensions (mm) | 207 × 175 × 190 | 207 × 175 × 190 |
| Positive terminal | Positive terminal on the left | Positive terminal on the left |
| Price | 49,70 € | 50,80 € |
Exide
EB501
Same size Kronobat SD-45.1 vs Exide EB501
Same size · same price
It has the same dimensions, voltage and technology as the SD-45.1, although it is not a manufacturer-approved equivalent. Compared with the SD-45.1 it has 5 Ah more and 50 A of cold cranking more. It costs the same. Check the positive terminal side and the original capacity before ordering; otherwise it is a straight swap.
| SD-45.1 | EB501 | |
|---|---|---|
| Capacity | 45 Ah | 50 Ah |
| Cold cranking (EN) | 400 A | 450 A |
| Technology | Lead-acid | Lead-acid |
| Dimensions (mm) | 207 × 175 × 190 | 207 × 175 × 190 |
| Positive terminal | Positive terminal on the left | Positive terminal on the left |
| Price | 49,70 € | 49,95 € |
Tudor
TB501
Same size Kronobat SD-45.1 vs Tudor TB501
Same size · +11,60 €
Same case and same technology as the SD-45.1: an alternative by size, not an official equivalent. Compared with the SD-45.1 it has 5 Ah more and 50 A of cold cranking more. It costs 11,60 € more. If the polarity matches and your car had a similar capacity, it works as a replacement; if in doubt, ask us with your model.
| SD-45.1 | TB501 | |
|---|---|---|
| Capacity | 45 Ah | 50 Ah |
| Cold cranking (EN) | 400 A | 450 A |
| Technology | Lead-acid | Lead-acid |
| Dimensions (mm) | 207 × 175 × 190 | 207 × 175 × 190 |
| Positive terminal | Positive terminal on the left | Positive terminal on the left |
| Price | 49,70 € | 61,30 € |
Automatic selection by dimensions (±3 mm), voltage, technology and capacity (−10 % / +20 %). Official manufacturer warranty on every option.
Other 45Ah batteries: We stock 33 models of 45 Ah to compare by price, technology and cold cranking: see all 45Ah batteries. Same size (207 × 175 × 190 mm): batteries of 207 × 175 × 190 mm.
Recommended accessories
Fitting it yourself? Step-by-step guide to replacing the battery →
Frequently asked questions
How is the Kronobat SD-45.1 battery installed in the vehicle?
Steps: 1) switch off and remove the key; 2) find the battery (bonnet, boot or under a seat); 3) undo the negative (−), then the positive (+); 4) remove the clamp and the old battery; 5) fit the new one facing the same way (positive on the left) to match the polarity; 6) connect the positive (+) and finally the negative (−). Tool: a 10 mm spanner. Time: 15-30 minutes on almost every car, and up to double if the battery is not under the bonnet but in the boot or under a seat. If the car manufacturer lists any extra step in the handbook, follow it. More detail in how to replace the car battery.
What is the service life of the SD-45.1 model?
As a guide, you can expect the Kronobat SD-45.1 to last 4 to 6 years in regular car use without Start-Stop, although the real figure may be higher or lower. What weighs most: temperature (cold makes starts harder and intense heat evaporates the electrolyte), frequent short trips, the condition of the alternator and charging system, power draw while parked and maintenance, not forgetting the type of car and Start-Stop.
What are the dimensions of the Kronobat SD-45.1 battery?
Length × width × height: 207x175x190 mm (L1 case). Height is measured to the top of the terminals. Measure your car's battery tray first; if the battery exceeds it by even a millimetre, the hold-down clamp may not close.
On which side is the positive of the SD-45.1 model?
On the Kronobat SD-45.1, the polarity is positive on the left. It must match your current battery: reversed polarity means lengthening cables or reconfiguring the system, with a risk of short circuit. To check, stand the battery in front of you with the terminals nearest you: the positive (+) is the one with the red ring.
Does this battery fit my car?
Three routes: the "Compatible vehicles" tab on this page, with the vehicles verified by our technical team; your number plate in the finder, from which DGT/DVLA/KBA detect model and engine; and WhatsApp, with make, model, engine and year, during business hours (Mon–Fri 10:00–13:30 and 16:30–18:00 (Spanish time, CET)). If our table and the car handbook disagree, go with what the manufacturer says.
Which batteries are equivalent to the Kronobat SD-45.1?
Technology matters too: in Start-Stop cars, an EFB cannot be replaced with a conventional battery. The options at the same level are in the "Equivalents" section of this page. Interchangeable means the same dimensions, same polarity, same Ah and same CCA; for the SD-45.1, 45 Ah (400 A cranking).
Kronobat SD-45.1 or Varta A9: which one to choose?
A technology step up: sealed AGM, with stronger cranking and a noticeably longer life than the SD-45.1 when the car draws a lot of power. Compared with the SD-45.1 it has 5 Ah more and 140 A of cold cranking more. It costs 69,20 € more. Choose it if your car required it from the factory or if you want the longest-lasting battery for this size; for normal use without Start-Stop, the SD-45.1 is plenty.
Kronobat SD-45.1 or Varta N50: which one to choose?
The EFB of this size, built for the simple Start-Stop that a conventional battery like the SD-45.1 cannot take. Compared with the SD-45.1 it has 5 Ah more and 150 A of cold cranking more. It costs 36,10 € more. Essential if your car has basic Start-Stop or came with EFB; without Start-Stop it is a durability upgrade you can skip.
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