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

![Kronobat SD-45.1T · Car battery 12V 45Ah 300A](https://bateriasonline.es/2249-home_default/kronobat-sd-45-1t.jpg)

> Kronobat SD-45.1T: 45 Ah car battery, 300 A (EN), 219×135×225 mm, positive terminal on the left. Equivalent to Exide EB451 and Tudor TB451.

**Category:** [Car batteries](https://bateriasonline.es/en/car-batteries) → [Kronobat](https://bateriasonline.es/en/kronobat-batteries)

- **Canonical URL**: https://bateriasonline.es/en/kronobat-sd-45-1t
- **Language**: en
- **Brand**: Kronobat
- **Reference**: BOL-KRONOBAT-SD-45.1T
- **MPN**: SD-45.1T
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Kronobat |
| Range | STANDARD |
| Application | Cars |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 45 Ah |
| Cold cranking amps (EN) | 300 A |
| Length | 219 mm |
| Width | 135 mm |
| Height | 225 mm |
| Weight | 10.8 kg |
| Polarity | Positive terminal on the left |

## Quick description

Kronobat SD-45.1T: car battery with 12 V, 45 Ah and 300 A cold cranking current, measuring 219 × 135 × 225 mm, with the positive terminal on the left. Need the positive terminal on the right? The same battery is the Kronobat SD-45.0T.

## Description

## Where the Kronobat SD-45.1T fits

The Kronobat SD-45.1T is made for petrol and diesel cars without automatic engine stop. The SD-45.1T covers the daily routine of a car without automatic engine stop: cold starts, short trips and loads with the ignition off.
At 45 Ah it is a small size: the usual choice for petrol superminis and city cars with little equipment. The SD-45.1T belongs to the Kronobat STANDARD range. [See all Kronobat batteries](https://bateriasonline.es/en/kronobat-batteries)

## Part numbers and codes for the Kronobat SD-45.1T

This is how the Kronobat SD-45.1T appears on the label and in parts catalogues:

| Commercial reference | SD-45.1T |
|---|---|
| Not to be confused with | Kronobat SD-45.1 (45 Ah, 400 A), Kronobat SD-45.0T (45 Ah, 300 A, positive terminal on the right) |

## Kronobat SD-45.1T vs PB-45.1F, SD-45.0T and PB-45.1T: which one to choose?

What sets the SD-45.1T apart from its neighbours in the Kronobat range:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Kronobat SD-45.1T (this one) | 45 Ah | 300 A | 219 × 135 × 225 | left | 10.8 kg |
| Kronobat PB-45.1F | 45 Ah | 330 A | 238 × 129 × 227 | left | 11.7 kg |
| Kronobat SD-45.0T | 45 Ah | 300 A | 219 × 135 × 225 | right | 10.8 kg |
| Kronobat PB-45.1T | 45 Ah | 330 A | 238 × 129 × 227 | left | 11.7 kg |

- Kronobat PB-45.1F: the same capacity, 30 A more cranking power, a different case (238 × 129 × 227 mm).
- Kronobat SD-45.0T: identical to the SD-45.1T except for the positive terminal, which is on the other side (positive terminal on the right).
- Kronobat PB-45.1T: the same capacity, 30 A more cranking power, a different case (238 × 129 × 227 mm).

## Equivalents and alternatives to the Kronobat SD-45.1T

Batteries that fit the SD-45.1T's tray with the same polarity; besides other conventional batteries, an EFB or AGM of this size is a valid upgrade for the SD-45.1T.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Varta B24 | Lead-acid | 45 Ah | 300 A | 220 × 135 × 225 |
| Exide EB451 | Lead-acid | 45 Ah | 330 A | 220 × 135 × 225 |
| Tudor TB451 | Lead-acid | 45 Ah | 330 A | 220 × 135 × 225 |
| Fulmen FB451 | Lead-acid | 45 Ah | 330 A | 220 × 135 × 225 |
| Deta DB451 | Lead-acid | 45 Ah | 330 A | 220 × 135 × 225 |

## What it means that the SD-45.1T is lead-acid

Inside, the SD-45.1T is classic lead-acid: liquid electrolyte and lead plates. If the SD-45.1T is left discharged for weeks it sulphates: a maintenance charger prevents this.

## What to look at before buying the SD-45.1T

- If your car has Start-Stop, the SD-45.1T is not the right one: it needs an EFB or an AGM.
- Check the EN amps on your battery: if it says 300 A or less, the SD-45.1T covers your engine.
- Capacity of the SD-45.1T: 45 Ah; the same as your current battery or slightly more is fine.
- Polarity of the SD-45.1T: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- The SD-45.1T needs 219 × 135 × 225 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Kronobat SD-45.1T

### SD-45.1T or PB-45.1F: which one suits me?

Compared with the SD-45.1T, the Kronobat PB-45.1F has 30 A more cranking power. If your current battery says 330 A or more, choose the PB-45.1F; if it says 300 A or less, the SD-45.1T is enough. Mind the space: the PB-45.1F measures 238 × 129 × 227 mm.

### Kronobat SD-45.1T or SD-45.0T: what is the difference?

Only the polarity: the SD-45.1T has the positive terminal on the left and the SD-45.0T the positive terminal on the right. Capacity (45 Ah), cranking power and dimensions are identical.

### Can the Kronobat SD-45.1T be used in a car with Start-Stop?

No. The SD-45.1T is a lead-acid battery for cars without automatic engine stop; Start-Stop needs an EFB or an AGM.

### How much does the Kronobat SD-45.1T weigh?

10.8 kg, with 45 Ah of capacity. For reference, the Kronobat PB-45.1F (45 Ah) weighs 11.7 kg.

### Which battery is equivalent to the Kronobat SD-45.1T?

With the same dimensions, polarity and similar capacity you have the Varta B24, Exide EB451 and Tudor TB451. As the SD-45.1T is a conventional battery, an EFB or AGM of the same size also works.

### Does the new battery need to be registered in the car?

In cars with energy management (common since 2010) it is worth registering the battery in the control unit so it adjusts charging. In older cars you just connect it.

## Other options if you are unsure about the SD-45.1T

- [Other car batteries](https://bateriasonline.es/en/car-batteries)
- [The whole Kronobat range](https://bateriasonline.es/en/kronobat-batteries)
- [Varta B24](https://bateriasonline.es/en/varta-b24) · 45 Ah, 300 A, 220×135×225 mm
- [Exide EB451](https://bateriasonline.es/en/exide-eb451) · 45 Ah, 330 A, 220×135×225 mm

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*bateriasonline.es — Batteries and accessories · 2026-11-10*