Japanese car battery sizes

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Japanese car battery sizes
Date the review was added: 2026-08-24 19:17:26
Japanese Standard
JIS D 5301:2019

To understand how and why batteries in Asian-brand vehicles have their own specific markings, it’s important to look at the standard that regulates them.

These Asian-size batteries follow the Japanese Standard JIS D 5301:2019, whose most recent revision was published in 2018. This standard outlines the requirements for starter lead-acid batteries used in Asian-manufactured vehicles, covering:

  • General requirements and testing methods
  • Battery dimensions
  • Marking specifications

That last point is particularly relevant because battery markings often cause confusion for car owners. How can you figure out a battery’s capacity, dimensions, polarity, and other specifications just by looking at its label?

We’ve analyzed the standard in detail and compiled a comprehensive table of battery markings. Our table includes information on sizes, recommended capacities, and cold cranking amps (CCA).

Marking

Marking article

Length mm.

Width mm.

Height mm.

RC Nominal reserve capacity (Cᵣₙ)

20 h rate capacity (C₂₀ₐₕ)

CCA Nominal reserve capacity (Cᵣₙ)

20 h rate current (I₂₀) (A)

26B17B17167127203/22729241851,1
28B1732281951,2
34B1738312401,3
28B19B19187127203/22732281901,2
34B1938312401,3
38B1943322651,3
40B1944322801,3
36B20B20197129203/22739322601,4
38B2043322651,5
44B2051393001,7
46B24B24238129203/22756422951,9
50B2460363252,0
55B2464423702,1
32C24C24238135207/23240321951,4
50D20D20202173204/22563463102,1
55D23D23232173204/22574553202,4
65D2390603702,8
70D2392604202,8
75D2395604652,9
80D2396625203,0
48D26D26260173204/22572402502,3
55D2682552902,6
65D2689603702,8
75D2698604503,0
80D26103634903,1
65D31D31306173204/22597653403,0
75D31116703803,5
95D31125745653,7
105D31132746553,9
115D31145817104,8
95E41E41410176234/213150924754,3
105E41160975404,3
115E411701006104,8
130E411951056805,4
115F51F51505182257/2131801105755,0
145F512251307356,1
150F512301257656,2
170F512451409256,2
145G51G51508222257/2132401406857,7
165G513001597107,7
180G512951498607,6
195G513201639308,2
190H52H52521278270/2203701877659,2
210H523801879109,4
245H52405205117010,0

How to Easily Understand the Markings from the Provided Table According to the Japanese Standard JIS D 5301:2019:

The First Digits
in the Marking

The first digits in the marking represent the performance indicator, which is calculated using a specific formula:

«First digits from the marking» = (√(CCA Cold Cranking Amps (Iᶜᶜᵉ) × RC Nominal Reserve Capacity (Cᵣₙ) ) / 2.8)

To obtain the final performance indicator for the battery, the manufacturer follows these steps:

  • Rounding the Number:
    If the number is less than 50, it is rounded in increments of 2 (for example, 36, 38, 40).
    If the number is 50 or greater, it is rounded in increments of 5 (for example, 50, 55, 60).
  • Adding a Correction Factor:
    If the number is less than 50, a value of up to 1.0 is added.
    If the number is 50 or greater, a value of up to 2.5 is added.

The resulting number becomes the final performance indicator.

The Following Letters
(from B to H)

The next letter (from B to H) indicates the size of the battery case.

The size is determined by two parameters: the width and the height of the battery case. If the letter is absent and the dimensions belong to other categories (F–H), then a different classification applies.

The Numbers
Following the Letter

The numbers following the letter represent the approximate length of the battery, rounded to the nearest centimeter.

The Last Character
(Letter)

The last character (a letter) denotes the specific placement of the negative terminal. If the code ends with the letter “L,” it indicates that the negative terminal is on the left; if it ends with “R,” the negative terminal is on the right. Note that models with “R” will be phased out in the future.

In Other Words:

When you look at a battery’s marking, each part provides you with specific information:

  • The first part (the digits) tells you how powerful or efficient the battery is.
  • The next letter shows the battery’s size (based on the width and height of the case).
  • Then, the length of the battery is indicated.
  • Finally, the arrangement of its terminals (positive and negative) is specified.