# Varta B20 · Car battery 12V 45Ah 400A

![Varta B20 · Car battery 12V 45Ah 400A](https://bateriasonline.es/1184-home_default/varta-b20.jpg)

> Varta B20 (ETN 545413040): 45 Ah car battery, 400 A (EN), 207×175×190 mm, positive terminal on the left. Equivalent to Kronobat SD-45.1.

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

- **Canonical URL**: https://bateriasonline.es/en/varta-b20
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-B20
- **EAN**: 4016987167755
- **MPN**: B20
- **Price**: 49,51 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Varta |
| Range | VARTA Dynamic SLI |
| Application | Cars |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 45 Ah |
| Cold cranking amps (EN) | 400 A |
| Length | 207 mm |
| Width | 175 mm |
| Height | 190 mm |
| Weight | 11.46 kg |
| Polarity | Positive terminal on the left |
| Case size | L1 (207 × 175 × 190 mm) |
| ETN code | 545413040 |

## Quick description

The Varta B20 (ETN 545 413 040, also written B 20 or 545413040) is a car battery with 12 V, 45 Ah and 400 A cold cranking current, case size L1 (207 × 175 × 190 mm), with the positive terminal on the left. With the positive terminal on the right, the exact counterpart is the Varta B19.

## Description

## The Varta B20 at a glance

The Varta B20 is a starter battery for cars without Start-Stop: it delivers the current the starter motor needs and then powers lights, control units and audio with the engine off. Its job is to start the engine in the cold with margin to spare and keep the car's electronics powered.
At 45 Ah it is a small size: the usual choice for petrol superminis and city cars with little equipment. Varta lists the B20 in its Dynamic SLI line. [The full range of Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Varta B20 codes and part numbers

Look for any of these B20 codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | B20 (B 20) |
|---|---|
| ETN code | 545413040 (also 545 413 040) |
| EAN | 4016987167755 |
| Case size (EN) | L1 |
| Case size according to Varta | H4R/L1R |
| UK code | 077 |
| Base hold-down | B13 |
| Also known as | Varta B 20 · Varta 545413040 · Varta 545 413 040 |
| Not to be confused with | Varta B23 (45 Ah, 300 A, positive terminal on the right), Varta B24 (45 Ah, 300 A), Varta B90 (190 Ah, 1,050 A) |

## Varta B20 vs C15, B19 and D43: differences

Torn between the B20 and another similar Varta? This is what changes:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta B20 (this one) | 45 Ah | 400 A | 207 × 175 × 190 | left | 11.46 kg |
| Varta C15 | 56 Ah | 480 A | 242 × 175 × 190 | left | 13.7 kg |
| Varta B19 | 45 Ah | 400 A | 207 × 175 × 190 | right | 11.46 kg |
| Varta D43 | 60 Ah | 540 A | 242 × 175 × 190 | left | 13.97 kg |

- Varta C15: 11 Ah more, 80 A more cranking power, a different case (242 × 175 × 190 mm).
- If the positive terminal of your battery is on the other side, the one you need is the Varta B19 (positive terminal on the right).
- Varta D43: 15 Ah more, 140 A more cranking power, a different case (242 × 175 × 190 mm).

## Equivalents and alternatives to the Varta B20

Same dimensions and polarity as the B20, with similar capacity and cranking power; as a conventional battery, the B20 can also be replaced by an EFB or AGM of the same size if you want more cycles.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Kronobat SD-45.1 | Lead-acid | 45 Ah | 400 A | 207 × 175 × 190 |

## Inside the B20: lead-acid technology

The B20 is a conventional lead-acid battery, with plates immersed in liquid electrolyte. In cars without energy management, the B20 needs no special registration: just connect it.

## What to look at before buying the B20

- If your car has Start-Stop, the B20 is not the right one: it needs an EFB or an AGM.
- The B20 delivers 400 A cold cranking (EN standard); do not go below what your original battery states.
- Capacity of the B20: 45 Ah; the same as your current battery or slightly more is fine.
- Polarity of the B20: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- Length, width and height of the B20: 207 × 175 × 190 mm (European case size L1).

## Frequently asked questions about the Varta B20

### Varta B20 or C15?

Compared with the B20, the Varta C15 has 11 Ah more and 80 A more cranking power. If your current battery says 480 A or more, choose the C15; if it says 400 A or less, the B20 is enough. Mind the space: the C15 measures 242 × 175 × 190 mm.

### What is the difference between the Varta B20 and the B19?

They are the same battery with the terminals swapped: positive terminal on the left on the B20, positive terminal on the right on the B19. Look at your current battery with the terminals facing you and pick the one that matches. That is why their ETNs only differ in the middle group: 545 413 040 for the B20 and 545 412 040 for the B19.

### What does the code 545 413 040 on the Varta B20 mean?

It is its ETN (European Type Number), also written 545413040. The first three digits (545) encode voltage and capacity: 12 V and 45 Ah (5xx = under 100 Ah, 6xx = 100 to 199 Ah, 7xx = 200 Ah or more). The middle group (413) identifies the specific model within that capacity, and the last three digits (040) multiplied by 10 give the cold cranking current: 400 A. Its twin with the positive terminal on the other side, the Varta B19, is 545 412 040: only the middle group changes.

### Can the Varta B20 be used in a car with Start-Stop?

No. The B20 is a lead-acid battery for cars without automatic engine stop; Start-Stop needs an EFB or an AGM.

### How much does the Varta B20 weigh?

The B20 weighs 11.46 kg. For reference, the Varta C15 (56 Ah) weighs 13.7 kg.

### Which battery is equivalent to the Varta B20?

With the same dimensions, polarity and similar capacity you have the Kronobat SD-45.1. As the B20 is a conventional battery, an EFB or AGM of the same size also works.

### What case size is the Varta B20?

Case size L1: 207 × 175 × 190 mm (Varta lists it as H4R/L1R). The B20 fits any standard L1 battery tray such as the Kronobat SD-45.1.

## Other options if you are unsure about the B20

- [All car batteries](https://bateriasonline.es/en/car-batteries)
- [Full Varta catalogue](https://bateriasonline.es/en/varta-batteries)
- [Kronobat SD-45.1](https://bateriasonline.es/en/kronobat-sd-45-1) · 45 Ah, 400 A, 207×175×190 mm

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