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Standards & norms

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.

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:

Equivalent motorcycle references
YTX14-BS — Yuasa (original reference) FTX14-BS — Furukawa GTX14-BS — other JIS manufacturers TX14-BS — generic JIS code, no prefix

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.

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