# Varta A6 (formerly F21) · Start-Stop battery 12V 80Ah 800A

![Varta A6 (formerly F21) · Start-Stop battery 12V 80Ah 800A](https://bateriasonline.es/1573-home_default/varta-a6.jpg)

> Varta A6 (formerly F21): 80 Ah Start-Stop battery, 800 A (EN), 315×175×190 mm, positive terminal on the right, AGM. Equivalent to Exide EK820.

**Category:** [Start-Stop batteries (AGM and EFB)](https://bateriasonline.es/en/start-stop-batteries-agm-efb) → [Varta](https://bateriasonline.es/en/varta-batteries)

- **Canonical URL**: https://bateriasonline.es/en/varta-a6
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-A6
- **EAN**: 4016987167243
- **MPN**: A6
- **Price**: 146,62 € (VAT incl., Spain)
- **Last updated**: 2026-11-07

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Varta |
| Range | VARTA Dynamic AGM |
| Application | Start-Stop cars |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 80 Ah |
| Cold cranking amps (EN) | 800 A |
| Length | 315 mm |
| Width | 175 mm |
| Height | 190 mm |
| Weight | 22.56 kg |
| Polarity | Positive terminal on the right |
| Case size | L4 (315 × 175 × 190 mm) |
| ETN code | 580901080 |

## Quick description

The Varta A6 (ETN 580 901 080, also written A 6 or 580901080) is a Start-Stop battery (AGM) with 12 V, 80 Ah and 800 A cold cranking current, case size L4 (315 × 175 × 190 mm), with the positive terminal on the right. It replaces the Varta F21, with the same technology, capacity, cranking power and dimensions.

## Description

## Where the Varta A6 fits

The Varta A6 is a battery for cars with Start-Stop: it withstands many more starting and partial-discharge cycles than a conventional battery and powers the electronics every time the engine stops at the lights. It takes repeated discharges without losing capacity the way a conventional battery would.
At 80 Ah it sits in the range of compact and mid-size diesels, SUVs and MPVs. Varta lists the A6 in its Dynamic AGM line. [More Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Varta A6 vs A7 and A5: which one to choose?

Torn between the A6 and another similar Varta? This is what changes:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta A6 (this one) | 80 Ah | 800 A | 315 × 175 × 190 | right | 22.56 kg |
| Varta A7 | 70 Ah | 760 A | 278 × 175 × 190 | right | 20.3 kg |
| Varta A5 | 95 Ah | 850 A | 353 × 175 × 190 | right | 25.73 kg |

- The Varta F21 is the previous name of this battery: Varta replaced it with the A6, keeping the same technology, capacity, cranking power and dimensions.
- Varta A7: 10 Ah less, 40 A less cranking power, a different case (278 × 175 × 190 mm).
- Varta A5: 15 Ah more, 50 A more cranking power, a different case (353 × 175 × 190 mm).

## Part numbers and codes for the Varta A6

The A6 is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | A6 (A 6) |
|---|---|
| Previous reference | Varta F21 |
| ETN code | 580901080 (also 580 901 080) |
| EAN | 4016987167243 |
| Case size (EN) | L4 |
| Case size according to Varta | H7/L4 |
| UK code | 115AGM |
| Base hold-down | B13 |
| Also known as | Varta A 6 · Varta F21 · Varta 580901080 · Varta 580 901 080 |

## Equivalents and alternatives to the Varta A6

Other AGM batteries that fit the A6's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Fulmen FK800 | AGM | 80 Ah | 800 A | 315 × 175 × 190 |
| Deta DK800 | AGM | 80 Ah | 800 A | 315 × 175 × 190 |
| Exide EK820 | AGM | 82 Ah | 800 A | 315 × 175 × 190 |
| Fulmen FK820 | AGM | 82 Ah | 800 A | 315 × 175 × 190 |
| Tudor TK820 | AGM | 82 Ah | 800 A | 315 × 175 × 190 |
| Deta DK820 | AGM | 82 Ah | 800 A | 315 × 175 × 190 |

Its Bosch equivalent is the Bosch S5 A11 (same ETN code 580 901 080). Bosch is not part of our catalogue; we list it so you can compare.

## What to look at before buying the A6

- Length, width and height of the A6: 315 × 175 × 190 mm (European case size L4).
- With the terminals facing you, the positive terminal of the A6 is on the right.
- Capacity of the A6: 80 Ah; the same as your current battery or slightly more is fine.
- Cold cranking: 800 A (EN), equal to or higher than the original.
- The A6 is AGM: it replaces an AGM or an EFB of the same size. You can swap an EFB for an AGM, but not an AGM for an EFB.

## What it means that the A6 is AGM

The A6 is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. It withstands many more cycles than a conventional lead battery, at the cost of being more sensitive to overcharging.

## Frequently asked questions about the Varta A6

### A6 or A7: which one suits me?

Compared with the A6, the Varta A7 has 10 Ah less and 40 A less cranking power. The A6 cranks harder; the A7 is only a good option if your original battery says 760 A or less. Mind the space: the A7 measures 278 × 175 × 190 mm.

### Does the Varta A6 replace the Varta F21?

Yes. The F21 is the previous name of this battery: Varta renamed it A6, with the same AGM technology, 80 Ah, 800 A cold cranking and a 315 × 175 × 190 mm case. If your car had an F21, the A6 is its direct replacement.

### What does the code 580 901 080 on the Varta A6 mean?

It is its ETN (European Type Number), also written 580901080. The first three digits (580) encode voltage and capacity: 12 V and 80 Ah (5xx = under 100 Ah, 6xx = 100 to 199 Ah, 7xx = 200 Ah or more). The middle group (901) identifies the specific model within that capacity, and the last three digits (080) multiplied by 10 give the cold cranking current: 800 A.

### Can the Varta A6 be used in a car with Start-Stop?

Yes. As an AGM battery, the A6 handles automatic engine stop and brake energy recovery, and it can replace an EFB of the same size.

### How much does the Varta A6 weigh?

22.56 kg, with 80 Ah of capacity. For reference, the Varta A7 (70 Ah) weighs 20.3 kg.

### Which battery is equivalent to the Varta A6?

Only other AGM batteries with its dimensions and polarity: Fulmen FK800, Deta DK800 and Exide EK820. Neither an EFB nor a conventional battery replaces the A6. Its Bosch equivalent is the Bosch S5 A11 (same ETN code 580 901 080). Bosch is not part of our catalogue; we list it so you can compare.

### What case size is the Varta A6?

Case size L4: 315 × 175 × 190 mm (Varta lists it as H7/L4). The A6 fits any standard L4 battery tray such as the Fulmen FK800.

## Other options if you are unsure about the A6

- [Other start-Stop batteries (AGM and EFB)](https://bateriasonline.es/en/start-stop-batteries-agm-efb)
- [More Varta models](https://bateriasonline.es/en/varta-batteries)
- [Tudor TK720](https://bateriasonline.es/en/tudor-tk720) · 72 Ah, 760 A, 278×175×190 mm
- [Exide EK720](https://bateriasonline.es/en/exide-ek720) · 72 Ah, 760 A, 278×175×190 mm

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