# Varta YTX24HL-BS · Motorcycle battery 12V 21Ah 340A

![Varta YTX24HL-BS · Motorcycle battery 12V 21Ah 340A](https://bateriasonline.es/1403-home_default/varta-ytx24hl-bs-521908034.jpg)

> Varta YTX24HL-BS (ETN 521908034): 21 Ah motorcycle battery, 340 A (EN), 205×90×164 mm, positive terminal on the right, AGM. Equivalent to Exide AGM12-23.

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

- **Canonical URL**: https://bateriasonline.es/en/varta-ytx24hl-bs-521908034
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-521908034
- **EAN**: 4016987149768
- **MPN**: 521908034
- **Last updated**: 2026-11-09

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Varta |
| Range | VARTA PowerSports AGM High Performance |
| Application | Motorcycles |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 21 Ah |
| Cold cranking amps (EN) | 340 A |
| Length | 205 mm |
| Width | 90 mm |
| Height | 164 mm |
| Weight | 7.7 kg |
| Polarity | Positive terminal on the right |
| ETN code | 521908034 |
| JIS code | YTX24 HL-BS |

## Quick description

Varta YTX24HL-BS (ETN 521 908 034, also written 521908034): motorcycle battery (AGM) with 12 V, 21 Ah and 340 A cold cranking current, measuring 205 × 90 × 164 mm, with the positive terminal on the right.

## Description

## Who the Varta YTX24HL-BS is for

The Varta YTX24HL-BS is a motorcycle starter battery: compact, vibration-resistant and with just the right power to turn the starter motor and feed the electronics. It is worth keeping the YTX24HL-BS on a maintenance charger if the bike is laid up over winter.
At 21 Ah it is a large battery for heavy motorcycles, jet skis and utility quads. Varta lists the YTX24HL-BS in its Powersports AGM High Performance line. [The full range of Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Part numbers and codes for the Varta YTX24HL-BS

The YTX24HL-BS is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | YTX24HL-BS |
|---|---|
| ETN code | 521908034 (also 521 908 034) |
| Manufacturer short code | TX24HL-BS |
| EAN | 4016987149768 |
| Base hold-down | B00 |
| Also known as | Varta 521908034 · Varta 521 908 034 · Varta TX24HL-BS |
| Not to be confused with | Varta YTX20HL-BS (18 Ah, 320 A) |

## Equivalents and alternatives to the Varta YTX24HL-BS

Other AGM batteries that fit the YTX24HL-BS's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide AGM12-23 | AGM | 21 Ah | 350 A | 205 × 90 × 165 |
| Exide ETX24HL-BS | AGM | 21 Ah | 350 A | 205 × 90 × 165 |
| Fulbat FTX24HL-BS | AGM | 22.1 Ah | 350 A | 205 × 87 × 162 |
| Varta TX24HL (FA) | AGM | 21 Ah | 330 A | 205 × 87 × 162 |

## Varta YTX24HL-BS vs TX24HL (FA) and T19BL (FA)

The real differences between the YTX24HL-BS and the closest Varta models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta YTX24HL-BS (this one) | 21 Ah | 340 A | 205 × 90 × 164 | right | 7.7 kg |
| Varta TX24HL (FA) | 21 Ah | 330 A | 205 × 87 × 162 | right | 7 kg |
| Varta T19BL (FA) | 18 Ah | 220 A | 186 × 82 × 171 | right | 5.55 kg |

- Varta TX24HL (FA): the same capacity, 10 A less cranking power, a different case (205 × 87 × 162 mm).
- Varta T19BL (FA): 3 Ah less, 120 A less cranking power, a different case (186 × 82 × 171 mm).

## Before ordering the YTX24HL-BS, check this

- Check the EN amps on your battery: if it says 340 A or less, the YTX24HL-BS covers your engine.
- Capacity of the YTX24HL-BS: 21 Ah; the same as your current battery or slightly more is fine.
- The YTX24HL-BS has the positive terminal on the right: compare it with your current battery.
- The YTX24HL-BS needs 205 × 90 × 164 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Varta YTX24HL-BS

### YTX24HL-BS or TX24HL (FA): which one suits me?

Compared with the YTX24HL-BS, the Varta TX24HL (FA) has 10 A less cranking power. The YTX24HL-BS cranks harder; the TX24HL (FA) is only a good option if your original battery says 330 A or less. Mind the space: the TX24HL (FA) measures 205 × 87 × 162 mm.

### Is the Varta 521908034 the same battery as the Varta YTX24HL-BS?

Yes. 521908034 is the ETN code Varta uses for its YTX24HL-BS battery, so you can search for it by either code.

### How much does the Varta YTX24HL-BS weigh?

7.7 kg, with 21 Ah of capacity. For reference, the Varta TX24HL (FA) (21 Ah) weighs 7 kg.

### Which battery is equivalent to the Varta YTX24HL-BS?

Only other AGM batteries with its dimensions and polarity: Exide AGM12-23, Exide ETX24HL-BS and Fulbat FTX24HL-BS. Neither an EFB nor a conventional battery replaces the YTX24HL-BS.

### Which side is the positive terminal on the Varta YTX24HL-BS?

On the YTX24HL-BS, the positive terminal is on the right with the terminals facing you: compare it with your current battery, because with reversed polarity the cables will not reach.

### How do I stop the motorcycle battery going flat in winter?

Connect it to a maintenance charger or disconnect it if the bike will sit for more than a month. A flat motorcycle battery sulphates in a few weeks.

## What it means that the YTX24HL-BS is AGM

The YTX24HL-BS 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.

## Keep comparing: alternatives to the YTX24HL-BS

- [All motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [More Varta models](https://bateriasonline.es/en/varta-batteries)
- [Exide AGM12-23](https://bateriasonline.es/en/exide-agm12-23) · 21 Ah, 350 A, 205×90×165 mm
- [Exide ETX24HL-BS](https://bateriasonline.es/en/exide-etx24hl-bs) · 21 Ah, 350 A, 205×90×165 mm

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