Lead-Acid Knowledge · JIS Battery Groups · Last reviewed 2026-09-22

N70 vs N100 Battery: JIS Truck Battery Sizes Compared

N70 and N100 are the two workhorse groups of the JIS N-series — the Japanese standard's heavy-duty battery family. N70 covers passenger cars and light trucks; N100 steps up to trucks and buses. The difference is mostly ~148 mm of case length, which buys the N100 roughly 30 Ah more capacity and ~100 A more CCA.

Side-by-side comparison

Cross-verified typical ranges from the World Battery Hub data section; a specific battery's datasheet wins. CCA figures are JIS D5301 (−15°C) — compare only within one standard (see what CCA is). For the N-series' bigger siblings, see the truck battery guide.

How JIS N-series naming works

In the JIS system, the letter marks the performance class and the number roughly tracks the 20-hour capacity: N is the heavy-duty class, and the figure approximates Ah — N70 ≈ 70 Ah, N100 ≈ 100 Ah, N120 ≈ 120 Ah, N150 ≈ 135 Ah, and N200 ≈ 200 Ah. The second code you see on labels — 65G24 for N70, 95E41 for N100 — is the case-size reference used in parts catalogues across Asia.

The naming matters because JIS codes are capacity-class labels, not physical-dimension labels the way BCI group numbers are. Two "N70" batteries from different makers share the footprint, but a JIS number says little about terminal orientation or hold-down style — those come from the vehicle's original fitment, which is why battery group size checks always start from the tray.

The physical difference: ~148 mm of length

Both groups share roughly the same width (~172 mm) and height (~213–222 mm) with JIS pencil-type posts; the entire step from N70 to N100 is length — about 148 mm (roughly 6 inches). The longer case holds more plate area, and the extra lead is the whole source of the N100's higher Ah, higher CCA and heavier weight.

The fit rule follows directly: an N100 drops into an N70 tray only if ~148 mm of length is spare. Many light trucks are offered with both groups from the factory — same tray, alternate hold-down position — but plenty are not. Measure the tray, don't trust the catalogue: see what size battery my car needs.

JIS CCA reads higher — compare within the standard

The single most misread number on these labels is CCA. JIS D5301 measures cold cranking amps at −15°C, while SAE J537 and EN 50342 test at −18°C. A warmer test prints a higher number, so an "800 CCA" N100 is not the same test as an "800 CCA" BCI Group 65. Read JIS to JIS, SAE to SAE — there is no universal conversion factor (see CCA vs CA vs MCA for the temperature ladder).

Which one fits your duty?

• Passenger car or light truck, 12V — N70 is the common Asian-OEM fitment; match the original spec rather than upgrading for its own sake.
• Medium truck, bus or heavy accessory load — N100 and up; the extra 30 Ah buys real endurance for lift gates, lights and sleeper-cab loads with the engine off.
• 24V systems — both groups are used in series pairs on heavy trucks; pairs must be matched for chemistry, capacity and age (see the truck battery page's 12V-vs-24V rule).
• Deep cycling duty — neither N-group is a deep-cycle battery; sustained cycling belongs to a deep-cycle design, not a cranking N-series unit.

Key takeaways

What procurement buyers should check

• Is the JIS code (N70 / N100) plus the case-size alias (65G24 / 95E41) confirmed against the vehicle's original fitment?
• Are quoted CCA figures tied to a named standard — JIS D5301 at −15°C, not a bare number?
• Is the terminal type (JIS type A thin post vs large taper) and polarity position verified for the fleet's cables?
• For 24V truck fleets: does the supplier quote matched pairs, and is pair replacement policy in the contract?
• Do quotations across suppliers compare like for like — same group, same CCA standard, same technology?
• See the JIS/DIN/BCI cross-reference trap covered in the buyer's spec comparison guide.

Frequently asked questions

What is the difference between N70 and N100 batteries?

Length, capacity and duty. Both are JIS D5301 12V lead-acid batteries with JIS type A (thin tapered) posts, but N100 is about 148 mm longer than N70 — roughly 408 × 172 × 213 mm versus 260 × 173 × 222 mm — and typically carries about 100 Ah and 800 CCA versus about 70 Ah and 700 CCA for N70. N70 serves passenger cars and light trucks; N100 is a heavy-duty group for trucks and buses.

Can I replace an N70 with an N100?

Only if the tray, hold-down and cables accept the ~148 mm longer N100 case. The extra capacity and CCA are real, but the physical fit decides. Terminals are the same JIS type A posts, so the cable clamps match — the tray length is the usual blocker.

Is the N70 CCA figure comparable to a BCI Group 65 CCA figure?

Not directly. N70 CCA is measured under JIS D5301 at −15°C, while BCI groups are typically rated under SAE J537 at −18°C. A warmer test prints a higher number, so JIS CCA and SAE CCA must be compared within their own standards, not across them.

What does the second code (65G24, 95E41) mean?

It is the JIS case-size reference used in Asian parts catalogues. 65G24 is the N70 case; 95E41 is the N100 case. Catalogues may list either the N-code or the case code, and both refer to the same physical battery footprint.

Sources

Cross-verified from the World Battery Hub entity database and public references; where sources differ, the difference is flagged rather than silently resolved.

• World Battery Hub data section — N70 reference page and N100 reference page.
• JIS D5301 — Japanese automotive lead-acid battery standard; N-series group codes and CCA test condition (−15°C).
• Manufacturer datasheets (GS Yuasa, Panasonic, AtlasBX) — N70/N100 dimensions, capacity and CCA cross-checks.
• Korean & Japanese battery manufacturers — JIS-series product line references.

Last reviewed: 2026-09-22