# Fulbat NH12-20 GEL 51913 · Motorcycle battery 12V 21.1Ah 235A

![Fulbat NH12-20 GEL 51913 · Motorcycle battery 12V 21.1Ah 235A](https://bateriasonline.es/648-home_default/fulbat-nh12-20-gel.jpg)

> Fulbat NH12-20 GEL (JIS 51913): 21.1 Ah motorcycle battery, 235 A (EN), 186×82×171 mm, positive terminal on the right, GEL.

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

- **Canonical URL**: https://bateriasonline.es/en/fulbat-nh12-20-gel
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-NH12-20 GEL
- **MPN**: NH12-20 GEL
- **Price**: 96,41 € (VAT incl., Spain)
- **Last updated**: 2026-11-09

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT Motorcycle GEL |
| Application | Motorcycles |
| Technology | GEL |
| Voltage | 12 V |
| Capacity | 21.1 Ah |
| Cold cranking amps (EN) | 235 A |
| Length | 186 mm |
| Width | 82 mm |
| Height | 171 mm |
| Weight | 5.55 kg |
| Polarity | Positive terminal on the right |
| JIS code | 51913 51814 |

## Quick description

Fulbat NH12-20 GEL (JIS 51913): motorcycle battery with 12 V, 21.1 Ah and 235 A cold cranking current, measuring 186 × 82 × 171 mm, with the positive terminal on the right.

## Description

## Who the Fulbat NH12-20 GEL is for

The Fulbat NH12-20 GEL is made for motorcycles, scooters and quads. It is worth keeping the NH12-20 GEL on a maintenance charger if the bike is laid up over winter.
At 21.1 Ah it is a large battery for heavy motorcycles, jet skis and utility quads. The NH12-20 GEL belongs to the Fulbat FULBAT Motorcycle GEL range. [More Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Equivalents and alternatives to the Fulbat NH12-20 GEL

No other reference in the catalogue fully matches the dimensions and polarity of the NH12-20 GEL; you will find the closest ones among our [motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries).

## Fulbat NH12-20 GEL vs FHD20HL-BS GEL and FTX24HL-BS GEL: which one to choose?

What sets the NH12-20 GEL apart from its neighbours in the Fulbat range:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulbat NH12-20 GEL (this one) | 21.1 Ah | 235 A | 186 × 82 × 171 | right | 5.55 kg |
| Fulbat FHD20HL-BS GEL | 21.1 Ah | 310 A | 175 × 87 × 155 | right | 6.36 kg |
| Fulbat FTX24HL-BS / F50-N18L-A/A2/A3 GEL | 22.1 Ah | 350 A | 205 × 87 × 162 | right | 7.1 kg |

- Fulbat FHD20HL-BS GEL: the same capacity, 75 A more cranking power, a different case (175 × 87 × 155 mm).
- Fulbat FTX24HL-BS / F50-N18L-A/A2/A3 GEL: 1 Ah more, 115 A more cranking power, a different case (205 × 87 × 162 mm).

## What to look at before buying the NH12-20 GEL

- The NH12-20 GEL needs 186 × 82 × 171 mm of space: measure it with the hold-down clamp in place.
- The NH12-20 GEL has the positive terminal on the right: compare it with your current battery.
- Capacity of the NH12-20 GEL: 21.1 Ah; the same as your current battery or slightly more is fine.
- The NH12-20 GEL delivers 235 A cold cranking (EN standard); do not go below what your original battery states.

## Frequently asked questions about the Fulbat NH12-20 GEL

### Fulbat NH12-20 GEL or FHD20HL-BS GEL?

Compared with the NH12-20 GEL, the Fulbat FHD20HL-BS GEL has 75 A more cranking power. If your current battery says 310 A or more, choose the FHD20HL-BS GEL; if it says 235 A or less, the NH12-20 GEL is enough. Mind the space: the FHD20HL-BS GEL measures 175 × 87 × 155 mm.

### How much does the Fulbat NH12-20 GEL weigh?

The NH12-20 GEL weighs 5.55 kg. For reference, the Fulbat FHD20HL-BS GEL (21.1 Ah) weighs 6.36 kg.

### Which side is the positive terminal on the Fulbat NH12-20 GEL?

The NH12-20 GEL has the positive terminal on the right, looking at the battery from its long side with the terminals closest to you.

### Does the Fulbat NH12-20 GEL come charged and ready to fit?

Sealed AGM and gel batteries leave the factory charged and ready. Conventional ones with a separate acid pack are activated when filled and should be charged before fitting.

## What it means that the NH12-20 GEL is GEL

Inside, the NH12-20 GEL holds its electrolyte in gel form. It is the classic technology for wheelchairs, scooters, motorhomes and solar.

## Keep comparing: alternatives to the NH12-20 GEL

- [Other motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [More Fulbat models](https://bateriasonline.es/en/fulbat-batteries)
- [Fulbat FB16CL-B GEL](https://bateriasonline.es/en/fulbat-fb16cl-b-gel) · 20 Ah, 240 A, 175×100×175 mm
- [Varta GEL-19Ah](https://bateriasonline.es/en/varta-gel-19ah-519901017) · 19 Ah, 170 A, 186×82×173 mm

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