# Varta B39 · Truck battery 12V 45Ah 300A

![Varta B39 · Truck battery 12V 45Ah 300A](https://bateriasonline.es/1541-home_default/varta-b39.jpg)

> Varta B39 (ETN 545200030): 45 Ah truck battery, 300 A (EN), 210×175×175 mm, positive terminal on the right, LB1 case. Ask for a no-obligation quote.

**Category:** [Truck, commercial and agricultural vehicle batteries](https://bateriasonline.es/en/truck-agricultural-batteries) → [Varta](https://bateriasonline.es/en/varta-batteries)

- **Canonical URL**: https://bateriasonline.es/en/varta-b39
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-B39
- **EAN**: 4016987166574
- **MPN**: B39
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Varta |
| Range | VARTA ProMotive SLI |
| Application | Trucks and commercial vehicles |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 45 Ah |
| Cold cranking amps (EN) | 300 A |
| Length | 210 mm |
| Width | 175 mm |
| Height | 175 mm |
| Weight | 10.76 kg |
| Polarity | Positive terminal on the right |
| Case size | LB1 (207 × 175 × 175 mm) |
| ETN code | 545200030 |

## Quick description

The Varta B39 (ETN 545 200 030, also written B 39 or 545200030) is a truck battery with 12 V, 45 Ah and 300 A cold cranking current, case size LB1 (210 × 175 × 175 mm), with the positive terminal on the right.

## Description

## Who the Varta B39 is for

The Varta B39 turns heavy diesel engines and powers cabs with high consumption. With 45 Ah, the B39 suits heavy vehicles that had a battery of that capacity.
In the Varta catalogue, the B39 belongs to the Promotive SLI line. [See all Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Equivalents and alternatives to the Varta B39

No other reference in the catalogue fully matches the dimensions and polarity of the B39; you will find the closest ones among our [truck, commercial and agricultural vehicle batteries](https://bateriasonline.es/en/truck-agricultural-batteries).

## Varta B39 vs C20: differences

How the B39 compares with Varta batteries of similar size and capacity:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta B39 (this one) | 45 Ah | 300 A | 210 × 175 × 175 | right | 10.76 kg |
| Varta C20 | 55 Ah | 420 A | 242 × 175 × 190 | right | 13.44 kg |

- Varta C20: 10 Ah more, 120 A more cranking power, a different case (242 × 175 × 190 mm).

## Inside the B39: lead-acid technology

Inside, the B39 is classic lead-acid: liquid electrolyte and lead plates. If the B39 is left discharged for weeks it sulphates: a maintenance charger prevents this.

## Check this before ordering the Varta B39

- Measure the space: the B39 takes up 210 × 175 × 175 mm (European case size LB1).
- The B39 has the positive terminal on the right: compare it with your current battery.
- Capacity of the B39: 45 Ah; the same as your current battery or slightly more is fine.
- The B39 delivers 300 A cold cranking (EN standard); do not go below what your original battery states.

## Varta B39 codes and part numbers

This is how the Varta B39 appears on the label and in parts catalogues:

| Commercial reference | B39 (B 39) |
|---|---|
| ETN code | 545200030 (also 545 200 030) |
| EAN | 4016987166574 |
| Case size (EN) | LB1 |
| Case size according to Varta | T4 |
| Base hold-down | B13 |
| Also known as | Varta B 39 · Varta 545200030 · Varta 545 200 030 |
| Not to be confused with | Varta B19 (45 Ah, 400 A), Varta B31 (45 Ah, 330 A), Varta B32 (45 Ah, 330 A) |

## Frequently asked questions about the Varta B39

### Varta B39 or C20?

Compared with the B39, the Varta C20 has 10 Ah more and 120 A more cranking power. If your current battery says 420 A or more, choose the C20; if it says 300 A or less, the B39 is enough. Mind the space: the C20 measures 242 × 175 × 190 mm.

### What does the code 545 200 030 on the Varta B39 mean?

It is its ETN (European Type Number), also written 545200030. 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 (200) identifies the specific model within that capacity, and the last three digits (030) multiplied by 10 give the cold cranking current: 300 A.

### How much does the Varta B39 weigh?

The B39 weighs 10.76 kg. For reference, the Varta C20 (55 Ah) weighs 13.44 kg.

### What case size is the Varta B39?

Case size LB1: 210 × 175 × 175 mm (Varta lists it as T4). The B39 fits any standard LB1 battery tray.

### Which side is the positive terminal on the Varta B39?

The B39 has the positive terminal on the right, looking at the battery from its long side with the terminals closest to you.

### Are truck batteries fitted in pairs?

Almost always, in series for 24 V. Replace them in matched pairs: mixing a new one with an old one unbalances charging and shortens the new one's life.

## Other options if you are unsure about the B39

- [More truck, commercial and agricultural vehicle batteries](https://bateriasonline.es/en/truck-agricultural-batteries)
- [Full Varta catalogue](https://bateriasonline.es/en/varta-batteries)

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