Battery group size, defined by BCI, specifies physical dimensions AND terminal placement. Two batteries with the same group size are interchangeable in terms of physical fit. It is not a performance rating — it is a dimensional standard.
What Happens When You Get Group Size Wrong
Poor terminal connection: Cables stretched and stressed — fire risk. Insufficient power: Smaller battery may not deliver rated CCA. Hold-down problems: Battery moves in tray during vibration.
BCI Group Size Reference
| Group | Dimensions (mm) | Common Applications |
|---|---|---|
| Group 24 | 260x173x225 | Light commercial, some UPS |
| Group 27 | 306x173x225 | Standard automotive |
| Group 31 | 330x173x240 | Commercial truck, marine |
| Group 35 | 230x175x225 | Japanese automotive |
| Group 65 | 306x190x235 | Large domestic, UPS |
CHISEN manufactures in 60+ BCI, 40+ DIN, and all common JIS group sizes.
Common Misconceptions
A bigger battery is always better. Not if it does not fit. CCA is all that matters. It determines starting performance — group size determines fit and safety.
FAQ
Q: Different group size than original? A: Only if the new battery fits properly, terminals reach, and hold-down works.
Q: Higher CCA always better? A: No — CCA must be appropriate for your engine and climate.
Need help? Contact CHISEN’s technical team.
Email: sales@chisen.cn
| WhatsApp: +86 131 6622 6999 |
|---|
www.chisen.cn
Contact CHISEN Today
Need a reliable lead-acid battery supplier for your project? CHISEN is a professional lead-acid battery manufacturer in China with 20+ years of experience, serving customers worldwide.
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