# JIS (Japanese standard, the reference for motorcycle batteries)

> Main coding for motorcycle batteries: YTX14-BS, FTX14-BS, TX14-BS. The first letter shows the manufacturer (Y=Yuasa, F=Furukawa) or may be absent.

**Categoría**: Standards & norms
**URL canónica**: https://baterias.com/gb/battery-glossary/jis
**Idioma**: en-GB

## Definition

JIS D 5301 is the Japanese battery standard and is today **the main reference for motorcycle batteries** (in cars its use has dropped in favour of EN/DIN). The **first letter indicates the manufacturer or origin** of the model; from the second letter onwards the code is identical across brands and describes the product. That is why codes sharing the same suffix are interchangeable:

{pills:Equivalent motorcycle references}
**YTX**14-BS — Yuasa (original reference)
**FTX**14-BS — Furukawa
**GTX**14-BS — other JIS manufacturers
**TX**14-BS — generic JIS code, no prefix

{section-moto}
Motorcycle batteries — the main reference today
Typical motorcycle codes follow the format **YTX14-BS, FTX14-BS, TX14-BS, GTX14-BS**, where the first letter identifies the manufacturer (or is absent). From the second position onwards the whole code describes the product and is **identical across brands**:
- **T** = sealed AGM construction (electrolyte immobilised in fibreglass mat, maintenance-free)
- **X** = power/dimension family within the catalogue
- **14** = size indicator (not an exact Ah value, but correlates — a YTX14-BS is around 12 Ah)
- **BS** = terminal type and packaging (supplied with acid packed separately for customer activation)
That is why YTX14-BS, FTX14-BS and TX14-BS batteries are **electrically and physically equivalent**: same dimensions, same capacity, same terminals and polarity. Only the manufacturer changes. You can pick the brand you prefer or the cheapest option without worrying about compatibility.

{section-auto}
Asian automotive — a different format
In **Toyota, Honda, Mazda, Suzuki, Nissan, Mitsubishi, Subaru and Daihatsu** JIS also appears, in two families of codes:
- Traditional: **NS40, N50, NS60, NS70, N100**
- Modern JIS D 5301: **55B24L, 75D23R, 85D26L** (combines performance, size and terminal position)
They usually have **B19 terminals** (longer than European B0) and, in many models, **inverted polarity** compared to the European standard.

If your motorcycle or Asian car needs a battery, **always look for the JIS equivalent** (the original battery shows it) — modern catalogues publish JIS↔EN cross-references, but going only by EN may lead to a battery with incompatible terminals or size.

## See also

- [EN 50342 (European SLI battery standard)](https://baterias.com/gb/battery-glossary/en-50342)
- [DIN (German battery code)](https://baterias.com/gb/battery-glossary/din)

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