The 24-85-13-A battery and Model B differ in performance characteristics and design specifications. The 24-85-13-A features a cold cranking amps (CCA) rating of 850 and reserve capacity (RC) of 130 minutes, making it suitable for harsh climates and extended power demands. In contrast, Model B (represented by codes like D26R) typically offers a lower CCA of 680 but prioritizes compact sizing with a 26cm length for space-constrained installations. Both follow industry-standard coding systems where numeric/letter combinations denote physical dimensions and terminal orientation.
What defines the performance metrics in these battery models?
Battery performance is determined by cold cranking amps (CCA) and reserve capacity (RC). The 24-85-13-A’s 850 CCA ensures reliable starts in sub-zero temperatures, while its 130-minute RC provides extended runtime for accessories without engine power. Comparatively, Model B’s lower 680 CCA trades raw power for compatibility with smaller engine bays. Practical example: In -20°C conditions, the 24-85-13-A maintains stable voltage during ignition 25% longer than Model B. Pro Tip: Always match CCA ratings to your region’s winter temperatures—underpowered batteries freeze faster.
How do sizing differences impact compatibility?
The 24cm length in 24-85-13-A requires specific tray dimensions, while Model B’s 26cm frame suits modified compartments. Check clearance for terminals: Code “A” indicates top-post terminals with left-side positive, whereas “R” (common in Model B) denotes right-side placement. For instance, retrofit installations often struggle with 24-85-13-A in European vehicles designed for 26cm batteries. Pro Tip: Use foam spacers for minor size mismatches, but never force-fit—pressure cracks may cause acid leaks.
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| Feature | 24-85-13-A | Model B |
|---|---|---|
| CCA Rating | 850 | 680 |
| Reserve Capacity | 130 min | 85 min |
| Terminal Orientation | Left (A) | Right (R) |
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FAQs
Only if CCA and physical dimensions align—temporary swaps risk alternator overload. Use jumper cables for partial charge sharing during stopgap use.
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Why does terminal orientation matter?
Modern vehicles route cables for specific layouts—reversed terminals may short-circuit ECUs. Always verify polarity markings before installation.
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