Q: How do I find the battery group number?
Look for a 2-4 digit code (e.g., 24F, 35) on the battery case, terminals, or label. Common locations include the top handle, front sticker, or side engraving. The group number specifies physical dimensions and terminal positions for vehicle compatibility.
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What Is a Battery Group Number and Why Is It Important?
A standardized classification (BCI Group Number) defining a battery’s physical size, terminal locations, and polarity. Matching this number ensures proper fitment, electrical compatibility, and prevents damage to vehicle components. Incorrect group numbers may cause short circuits or failed starts.
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Top 5 best-selling Group 14 batteries under $100
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Weize YTX14 BS ATV Battery  |
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UPLUS ATV Battery YTX14AH-BS  |
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Where Are Common Placement Points for Battery Group Numbers?
1. Case Embossing: Raised lettering on top/side casing
2. Color-Coded Labels: White/yellow stickers with alphanumeric codes
3. Terminal Markers: Engravings near positive/negative posts
4. Handle Imprints: Molded text on carry handles (common in Group 65/78 batteries)
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How to Decipher Letters and Numbers in Battery Group Codes?
Example: 24F
– 24: 12.4″ L x 6.8″ W dimensions
– F: Reverse terminal orientation (positive on right)
Group 35: 9.1″ L x 7″ W with top-post terminals. BCI charts correlate numbers to measurements and terminal types (SAE/JIS/Type A).
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How Do Battery Types (AGM/EFB/Li-ion) Affect Group Numbering?
AGM batteries (e.g., Group 48 H6) use identical sizing but higher CCA ratings. Lithium batteries like Ionic 35 retain group numbers despite reduced weight. EFB batteries (Group 94R) add “R” for reverse orientation. Always verify BCI equivalency charts when cross-referencing chemistry types.
“Group numbers are the DNA of automotive batteries. With 43% of premature failures stemming from incorrect sizing, we recommend triple-checking BCI charts and using laser measurement tools. New modular battery trays complicate identification—always cross-reference the manufacturer’s engineering specs, not just visual matches.”
— Dr. Elena Torres, Automotive Electrification Specialist
FAQs
- Do electric vehicles use BCI group numbers?
- Most EVs (Tesla, Nissan Leaf) utilize proprietary battery packs, though hybrid models like Prius still use Group 35/47.
- How often do battery group standards change?
- BCI updates guidelines every 5-7 years. The 2023 revision added Groups 96/97 for start-stop systems.
- Can two group numbers fit the same vehicle?
- Yes—Group 34 and 34/78 share dimensions but differ in terminal types (top-post vs. side-post combinations).