BCI Group 31 / 8D Truck Batteries — DINWEYS Heavy-Duty OEM
DINWEYS BCI Group 31 and 8D truck batteries for North American vehicles — available on request from Chengguang Power Tech Co., Ltd.'s BCI-standard line.
Key Takeaways
- **Group 31 is the modern North American standard; 8D/4D are larger legacy sizes** — match tray and electrical demand, not brand habit.
- **Everything here is made-to-order** — MOQ 1×20ft, 20–45 days production plus transit; there is no BCI shelf stock.
- **Specs are confirmed on inquiry** — BCI is a custom line, so terminal type (stud vs post) and rating are fixed per order.
- **Group 31 serves Class 7–8 trucks and buses; 8D suits high-demand heavy equipment** — the split is about sustained load, not just size.
- **Do not force JIS or DIN models into BCI trays** — the three sizing systems are dimensionally incompatible.
For North American and Latin American markets, DINWEYS supplies BCI-standard batteries on a made-to-order basis. Our core stocked lines are JIS and DIN, but BCI Group 31 and 8D are produced to specification for distributors and fleets that need them.
Group 31 is the modern heavy-duty standard — the go-to for Class 7–8 trucks, buses and off-highway equipment in North America. Group 8D is the larger, higher-capacity classic size still specified for some heavy equipment. Both are produced on the same 18 automated lines as our JIS and DIN ranges, under the same IATF 16949 quality system.
Because BCI production is made-to-order, standard MOQ is 1 × 20ft container with a lead time of 20–45 days. Contact us with your target group size, CCA requirement and destination to confirm specification and pricing.
Specifications
| Specification | Value |
|---|---|
| Indicative minimum unit price | From US$80 per unit — final pricing confirmed on quotation (quantity, market and OEM terms apply) |
| Group 31 | 12V, North American heavy-duty standard — available on request |
| Group 8D / 4D | 12V, large-capacity legacy sizes — available on request |
| Standard | BCI (SAE J537 CCA test) |
| Availability | Made-to-order via Chengguang Power Tech Co., Ltd. BCI line |
| MOQ | 1 × 20ft container (flexible for trial orders) |
| Lead Time | 20–45 days production + transit |
Specifications are representative for this model. Exact CCA, capacity and dimensions are confirmed per batch on the certificate of analysis — contact us for a full datasheet.
Understanding These Specifications
A BCI group size describes the physical envelope — length, width, height — and the terminal layout, not the electrical rating. Group 31 is today's heavy-duty standard; Group 8D and 4D are larger legacy sizes. Matching the group size is what makes the battery fit the tray and reach the cables.
BCI batteries are CCA-rated to the SAE J537 test — the same 30-second, −18°C (0°F), 7.2V definition used for JIS batteries. We confirm the exact CCA, capacity and terminal configuration for your group size when you inquire.
Because BCI production is made-to-order, we build to your specification — group size, CCA, terminal type and orientation, and (where required) stud or post terminals. Final figures are documented in the datasheet and quotation.
Model Comparison
| Aspect | Group 31 | Group 8D / 4D |
|---|---|---|
| Voltage | 12V | 12V |
| Positioning | Modern heavy-duty standard | Larger, higher-capacity legacy sizes |
| Typical use | Class 7–8 trucks, buses, off-highway | Heavy equipment with high electrical demand |
| Terminals | Stud or post — to specification | Stud or post — to specification |
| Availability | Made-to-order | Made-to-order |
| Specification | Confirmed on inquiry | Confirmed on inquiry |
Typical Applications
- North American Class 7–8 trucks
- Off-highway equipment
- Latin American heavy vehicles
Application Scenarios in Detail
North American Class 7–8 trucks
Group 31 is the default commercial-truck size in North America, specified by most Class 7–8 OEMs. DINWEYS builds Group 31 to your CCA and terminal spec on the same automated lines as our JIS and DIN ranges.
Off-highway equipment
Construction, agricultural and mining machines subject batteries to heavy vibration and irregular duty. We match plate design and terminal type to the equipment's demands rather than shipping a one-size-fits-all unit.
Latin American heavy vehicles
Latin American fleets commonly run mixed North American and European platforms. We supply BCI sizes alongside our JIS and DIN lines so a single importer can consolidate sourcing in one container.
Maintenance & Care
For flooded BCI batteries, check electrolyte and top up with distilled water; sealed AGM or EFB builds are maintenance-free.
Clean and tighten terminals (stud or post) and protect them from corrosion — a poor connection is a leading cause of no-start on heavy equipment.
Store fully charged in a cool, dry place and recharge after any deep discharge to prevent sulfation.
Frequently Asked Questions
Do you stock BCI Group 31 batteries?
BCI-standard batteries are produced on request. Our core stocked lines are JIS and DIN standards; BCI Group 31/8D are made-to-order.
What is the MOQ for BCI batteries?
Standard MOQ is 1 × 20ft container, with flexibility for trial orders. Contact us for current terms.
What is the difference between Group 31 and Group 8D?
Group 8D is a larger, higher-capacity battery than Group 31. Group 31 is the modern heavy-duty standard; 8D is an older large-capacity size. Both are available on request.
What lead time should I expect?
Standard lead time is 20–45 days for made-to-order BCI batteries, depending on specification and order volume. Confirm current lead times when you inquire.
Do you supply BCI batteries for North America?
Yes, on a made-to-order basis. Contact us with your target group size, CCA requirement and destination to confirm specification and pricing.
Can you match the CCA of my existing Group 31?
Yes. Because BCI batteries are made-to-order, we confirm the exact CCA, capacity and terminal configuration against your existing battery or vehicle specification before production.
Do you build Group 31 in AGM or EFB?
Yes — we can build BCI sizes in flooded, EFB or AGM technology depending on your duty cycle, vibration and electrical load. Confirm the technology when you inquire.
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Related Technical Documentation
From the DINWEYS Knowledge Hub.
Technical review — Reviewed by the DINWEYS technical team. Manufacturer: Chengguang Power Tech Co., Ltd. Data source: manufacturer specification and test documentation. Specifications vary by model and standard; confirm final values with the manufacturer.