55B24 Battery (N45/N40): Specs, Fitment, and Cross-Reference
Part of the 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:
- 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.
- 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 · View 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 — wider (173 mm), higher capacity (60 Ah). Upgrade if the tray allows.
- 65D26 Battery — full-size (260 × 173 mm) upgrade for larger vehicles.
- 55B24 — Full Specification
- JIS Battery Standard Guide
- Request OEM Quote
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 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