---
title: "55B24 Battery (N45/N40): Specs, Fitment, and Cross-Reference"
id: "310"
type: "post"
slug: "jis-55b24"
published_at: "2026-10-21T05:30:32+00:00"
modified_at: "2026-10-21T05:30:32+00:00"
url: "https://chengguangenergy.com/jis-55b24/"
markdown_url: "https://chengguangenergy.com/jis-55b24.md"
excerpt: "55B24 (N45/N40) battery — 45 Ah, 370 CCA JIS compact. Full specs, 238×129 mm dimensions, vehicle fitment, manufacturing, QC gates, and BCI cross-reference."
taxonomy_category:
  - "Market Standards"
---

> Part of the **[JIS Battery Standard](/jis-battery-standard/)** guide.

The 55B24 is the smallest JIS battery in the Chengguang range — a narrow-frame (129 mm wide) design for compact sedans, hatchbacks, and kei cars where tray space is limited. It delivers 45 Ah and 370 CCA, adequate for 1.3–1.6 L gasoline engines in temperate-to-warm climates.

## Key Takeaways

- **Specs** — 45 Ah (C20), 370 CCA (SAE) in the narrowest JIS case (238 × 129 mm) — for compact cars and 1.3–1.6 L engines.
- **Aliases** — N45 and N40 are regional names for the same 55B24 case; the 45 Ah rating covers both designations.
- **Fitment** — Toyota Vios/Yaris, Honda City/Jazz, Suzuki Swift; verify the ~130 mm tray width first.
- **Mounting** — B00 top-frame hold-down, T1 small posts — do not substitute a DIN (B13) or BCI battery without an adapter.
- **Build** — Calcium-calcium (Ca-Ca) maintenance-free grid, produced on a small-frame automated line at 3,000–4,000 units/day.

## Quick Reference

| Parameter | Specification |
| --- | --- |
| Model | 55B24 |
| Also Known As | N45, N40 |
| Standard | JIS |
| Battery Type | SLI |
| Nominal Voltage | 12 V |
| Capacity (C20) | 45 Ah |
| CCA Rating | 370 A (SAE) |
| Dimensions (L×W×H) | 238 × 129 × 202–227 mm |
| Terminal Type | T1 small post |
| Polarity | Left (−), Right (+) — JIS type [0] |
| Hold-Down | B00 (top frame) |
| Approximate Weight | 11–14 kg |
| Chengguang SKU | CG-JIS-55B24 |

> **Specification ranges:** values are typical production ranges. Exact CCA and Ah vary by batch — request the technical data sheet for your order.

## Case & Terminal Identification

The 55B24 is defined by its **129 mm width**, the narrowest case in the Chengguang JIS range. It uses T1 small-post terminals and a B00 top-frame hold-down. The label reads **55B24**, **N45**, or **N40** depending on the target market.

| Identifier | Value | Check |
| --- | --- | --- |
| Case width | 129 mm | Narrow frame (B-series) |
| Case length | 238 mm | Shortest JIS case |
| Terminal | T1 small post | Small-diameter post |
| Hold-down | B00 | Top frame clamp |

Measure the tray width before ordering: a ~130 mm tray points to the 55B24; a ~175 mm tray opens the D-series.

## Vehicle Applications

Small passenger cars, compact sedans, and kei cars with 1.3–1.6 L gasoline engines.

| Brand | Compatible Models |
| --- | --- |
| Toyota | Vios, Yaris, Agya, Avanza (some) |
| Honda | City, Jazz, Brio, Mobilio |
| Suzuki | Swift, Dzire, Alto |
| Nissan | March, Almera, Note |
| Daihatsu | Terios, Sirion, Xenia |
| Mitsubishi | Mirage, Attrage |

Fitment is a market-based guide — verify tray dimensions (238 × 129 mm), terminal position, and hold-down type before ordering.

## Regional Markets

| Region | Demand | Segment |
| --- | --- | --- |
| Southeast Asia | Highest volume | Compact car core market |
| Africa | East/West | Compact car segment |
| Middle East | Moderate | Small car segment |
| Oceania | Light | Light vehicles |

## Manufacturing & Grid Alloy

The 55B24 is built on Chengguang’s small-frame automated line in **Jinzhou, Hebei, China** (IATF 16949:2016 certified):

- **Grid alloy** — calcium-calcium (Ca-Ca) for maintenance-free operation with low water loss.
- **Plate design** — reinforced thin plates engineered for reliable starting within the compact 238 × 129 mm envelope.
- **Throughput** — 3,000–4,000 units/day across all brand labels, with full batch traceability from grid casting to container loading.

The same narrow-frame tooling is shared across N45/N40/55B24 labels — only the terminal decal and carton change per market.

## Testing & Quality Control

Every 55B24 passes a two-tier QC gate before release:

| Test | Standard | Pass Criteria | Coverage |
| --- | --- | --- | --- |
| CCA Cold Cranking | SAE J537 at −18 °C | >370 A | 100% |
| Open Circuit Voltage | — | >12.60 V after formation | 100% |
| Visual Inspection | — | Case, terminals, label, polarity | 100% |
| C20 Capacity | IEC 60095-1 | ≥95% of rated 45 Ah | Batch |
| Charge Acceptance | IEC 60095-1 | Current at 14.4 V | Batch |
| Vibration | JIS D 5301 | — | Batch |

> 100% of units are CCA-tested and OCV-checked; capacity, charge acceptance, and vibration are sampled per batch. Every shipment includes a Certificate of Analysis (CoA).

## Charging & Service Life

- **Charge voltage** — standard SLI absorption 14.4–14.8 V; alternator output should sit at 13.8–14.4 V in service.
- **Service life** — 2–4 years in temperate climates; **18–24 months in hot climates (35–45 °C)**, where heat is the dominant aging factor.

## Sizing Check — Worked Example

A 1.5 L gasoline hatchback in two markets shows why the 55B24 is the right call in one and marginal in the other:

1. **Warm climate (SE Asia, 30–40 °C).** A 1.5 L engine needs roughly 300–350 CCA. The 370 CCA rating clears this with margin — heat shortens *life*, not cold-start capability, so the 55B24 is correct.
2. **Cold-winter market (−20 °C).** Apply the ~20% cold-weather CCA margin: 370 × 1.2 ≈ **444 CCA**. The 55B24 is now borderline. If the tray allows (173 mm width), step up to the 55D23 at 500 CCA for guaranteed cold cranking.

Runtime arithmetic: 45 Ah (C20) = 2.25 A for 20 hours. A 5 A accessory load draws the battery to full discharge in ~9 hours (45 ÷ 5) — in practice, keep discharge above ~50% depth to protect cycle life.

## Cross-Reference

| Model | Standard | Relationship |
| --- | --- | --- |
| N45 | JIS | Alias — same case, 45 Ah class |
| N40 | JIS | Alias — same case, 40 Ah class |

The 55B24 rating of 45 Ah covers both the N45 and N40 designations. There is **no direct DIN equivalent** for the 129 mm narrow frame — the closest DIN (56638/DIN66) is a 175 mm-wide case, so DIN-to-JIS substitution here always requires a tray adapter.

## Cross-Standard Equivalents

| Standard | Model | Confidence | Note |
| --- | --- | --- | --- |
| BCI | Group 35 / 51R | Medium | Verify terminal type and tray |

> Cross-standard matches are dimensional approximations only — electrical specs differ by standard and test method. Always verify tray dimensions, terminal type, and hold-down (B00 vs B13) before substituting.

## OEM & Private Label Availability

The 55B24 is available for **OEM manufacturing** under your brand from Chengguang Power Tech:

- Custom label, case color, terminal type, and retail packaging
- Full batch traceability — raw material lot to shipping container
- 100% pre-shipment CCA and capacity testing with CoA
- DG-compliant export packaging (UN 2794 / Class 8)
- Technical data sheet, MSDS, and Certificate of Analysis per shipment

[Request OEM Quote](https://chengguangenergy.com/contact/)
 · [View OEM Process](https://oem.chengguangenergy.com/oem-process/)

## Frequently Asked Questions

**Is N45 the same as 55B24?** Yes — N45 (and N40) are regional names for the same 55B24 case; the 45 Ah rating covers both designations.

**Can I upgrade from 55B24 to 55D23?** Only if the tray allows — the 55D23 is 44 mm wider (173 vs 129 mm). Measure before buying.

**What BCI group replaces a 55B24?** Group 35/51R is the closest cross-reference, but BCI mounting differs from JIS B00 — verify terminal type and tray dimensions.

**How long does a 55B24 last?** 2–4 years in temperate climates; 18–24 months in hot climates. Regular charging-system checks (alternator 13.8–14.4 V) extend service life.

**Is the 55B24 maintenance-free?** Yes — the Ca-Ca grid alloy minimizes water loss, so no electrolyte topping-up is required under normal operation.

## Related Models

- [55D23 Battery](/jis-55d23/) — wider (173 mm), higher capacity (60 Ah). Upgrade if the tray allows.
- [65D26 Battery](/jis-65d26/) — full-size (260 × 173 mm) upgrade for larger vehicles.
- [55B24 — Full Specification](https://data.chengguangenergy.com/battery-models/jis/55b24/)
- [JIS Battery Standard Guide](/jis-battery-standard/)
- [Request OEM Quote](https://chengguangenergy.com/contact/)

## Author & Factory Credentials

Authored by the **Chengguang Engineering Team** — application and process engineers at Chengguang Power Tech, an automotive battery manufacturer in Jinzhou, Hebei, China. Content is reviewed by the **IATF 16949 Quality Department** against production data and third-party test reports before publication.

**Factory certifications:** IATF 16949 (automotive quality) · ISO 9001 (quality management) · ISO 45001 (occupational safety) · CE marking (EU compliance).

Full test reports and the Certificate of Analysis (CoA) are published on the [Battery Database](https://data.chengguangenergy.com/battery-models/)
 and ship with every order.

## Sources & Verification

Specifications on this page are sourced from Chengguang Power Tech factory technical documentation and tested to JIS D 5301, DIN EN 50342-1, SAE J537, and IEC 60095-1. Contact Chengguang for the exact data sheet. Every batch ships with a Certificate of Analysis (CoA).

*Author: Chengguang Engineering Team · Reviewed: IATF 16949 Quality Department · Last updated: 2026-08-19*

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