145G51 Battery (N150): Heavy-Duty Truck & Bus Battery Specs
Part of the JIS Battery Standard guide.
The 145G51 (N150) is a commercial-grade heavy-duty JIS battery for medium-duty trucks, large buses, construction equipment, and marine applications. Thick positive plates (3.0+ mm), lead-antimony grids, and a deep-sump design deliver vibration resistance and sustained high-current capability that passenger-car batteries cannot match.
Key Takeaways
- Specs — Heavy-duty: 120–135 Ah, 800–900 CCA, thick Pb-Sb plates, 508 × 222 mm, 30–38 kg.
- Fitment — Medium trucks (Isuzu F-Series, Hino 300/500, Fuso Canter), buses, construction equipment — not passenger cars.
- 24 V — Run two in series; T1 large posts and B00 hold-down.
- Build — Pb-Sb thick grids (3.0–3.5 mm), deep-sump reservoir, double-sealed cover, 800–1,200 units/day.
Quick Reference
| Parameter | Specification |
|---|---|
| Model | 145G51 |
| Also Known As | N150 |
| Standard | JIS |
| Battery Type | Heavy Duty |
| Nominal Voltage | 12 V |
| Capacity (C20) | 120–135 Ah |
| CCA Rating | 800–900 A (SAE) |
| Dimensions (L×W×H) | 508 × 222 × 212–240 mm |
| Terminal Type | T1 large post |
| Polarity | Left (−), Right (+) — JIS type [0] |
| Hold-Down | B00 (top frame) |
| Approximate Weight | 30–38 kg |
| Chengguang SKU | CG-JIS-145G51 |
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
A massive case (508 × 222 mm) with T1 large-post terminals (∅19.5 mm positive, ∅17.9 mm negative). The label reads 145G51 or N150. The weight alone — 30–38 kg, roughly double a passenger-car battery — is the most obvious identifier.
| Identifier | Value | Check |
|---|---|---|
| Case length | 508 mm | Heavy-duty frame (G-series) |
| Case width | 222 mm | Wide heavy-duty case |
| Terminal | T1 large post | Large-diameter post |
| Weight | 30–38 kg | Double a car battery |
Vehicle Applications
Medium-duty trucks (4–8 L diesel), large buses, construction machinery, generators, and marine starting. Not for passenger vehicles.
| Category | Compatible Equipment |
|---|---|
| Isuzu | F-Series, Forward |
| Hino | 300, 500 Series |
| Fuso | Canter, Fighter |
| UD Trucks | Croner, Quester |
| Construction | Excavators, wheel loaders, bulldozers |
| Marine | Diesel inboard engines, commercial vessels |
Fitment is a market-based guide — verify tray dimensions, terminal position, and hold-down before ordering. For 24 V systems, run two 145G51 batteries in series.
Regional Markets
| Region | Demand | Segment |
|---|---|---|
| Africa | Major | Commercial vehicle aftermarket |
| Middle East | Strong | Trucks and buses |
| Southeast Asia | Strong | Commercial fleet |
| Latin America | Moderate | — |
Manufacturing & Grid Alloy
The 145G51 runs on Chengguang’s dedicated heavy-duty line in Jinzhou, Hebei, China:
- Grid alloy — lead-antimony (Pb-Sb) thick grids (3.0–3.5 mm) for structural integrity under vibration.
- Deep-sump design — extra electrolyte reservoir below the plates for extended service intervals.
- Cover — double-sealed with labyrinth venting.
- Welds — reinforced COS straps and intercell welds for sustained high current.
- Throughput — 800–1,200 units/day.
Note: Pb-Sb grids consume some water — periodic electrolyte level checks are part of normal heavy-duty maintenance, unlike the maintenance-free Ca-Ca passenger range.
Testing & Quality Control
| Test | Standard | Pass Criteria | Coverage |
|---|---|---|---|
| CCA Cold Cranking | SAE J537 at −18 °C | >800 A | 100% |
| Open Circuit Voltage | — | >12.60 V after formation | 100% |
| High-Rate Discharge | 30-second test | Voltage stability | 100% |
| Visual Inspection | — | Case, terminals, label, polarity | 100% |
| C20 Capacity | IEC 60095-1 | ≥95% of rated Ah | Batch |
| Reserve Capacity | SAE J537 | 200–250 min typical | Batch |
| Severe Vibration | SAE J537 | 5g RMS, 8 hours | Batch |
| Thermal Cycling | −40 °C to +70 °C | No leakage, CCA retention | Batch |
| Deep-Cycle Endurance | — | 80% DoD | Batch |
Charging & Service Life
- Charge voltage — flooded Pb-Sb absorption 14.4–15.0 V; equalize periodically if specific-gravity spread exceeds 0.030.
- Service life — 2–4 years in commercial service; vibration and deep cycling are the primary wear factors.
Sizing Check — Worked Example
A medium truck needs 24 V and high reserve for overnight loads:
- 24 V series. Two 145G51 units in series give 24 V at 120–135 Ah and 800–900 CCA — the standard medium-truck configuration. Use identical age/spec batteries and replace both together.
- Reserve capacity. At 200–250 min RC (25 A to 10.5 V), a 145G51 supports a 25 A overnight load (reefer + telematics + lighting) for 3.3–4.2 hours before hitting 10.5 V — budget two units in parallel (or step to the 190H52) for a 10-hour stand.
Cross-Reference
| Model | Standard | Relationship |
|---|---|---|
| N150 | JIS | Alias — same case |
N150 is the Middle East/Africa designation for the 145G51.
Cross-Standard Equivalents
| Standard | Model | Confidence | Note |
|---|---|---|---|
| DIN | 60038 (DIN100) | Low | Heavy-duty vs SLI — different class |
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 145G51 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
Can I use a 145G51 in a car? No — the 508 × 222 mm case and 30–38 kg weight are for trucks and buses. A passenger tray will not accept it.
How do I run 24 V? Two identical 145G51 units in series; replace both together, never one at a time.
145G51 vs 190H52? The 145G51 suits medium trucks and buses (4–8 L diesel); the 190H52 is larger (521 × 278 mm, 200 Ah / 1,100 CCA) for heavy trucks and equipment (>8 L diesel).
What is the service life? 2–4 years in commercial service. Vibration and deep cycling are primary wear factors; regular electrolyte checks extend life (Pb-Sb grids consume some water).
Related Models
- 190H52 Battery — larger (521 × 278 mm), 200 Ah. For heavy trucks and equipment.
- 105D31 Battery — passenger battery (306 mm, 90 Ah). Not a replacement.
- 145G51 — 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