Clark S30 12V (part 06-85-13) requires a 12V lead-acid battery meeting BCI Group U1 specifications, typically rated 35-50Ah with SAE terminals. OEM replacements must match 245mm(L)×140mm(W)×200mm(H) dimensions and 15-18kg weight. Aftermarket options like Full River DC12-35 or Vmax SLR35 are cross-compatible, but verify terminal polarity alignment (positive on right) before purchase.
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What are the critical specifications for Clark S30 batteries?
Clark S30 batteries demand 12V nominal voltage and 325-350CCA cold cranking amps. Terminal type (SAE automotive posts) and case dimensions (Group U1 standard) are non-negotiable parameters. Pro Tip: Check venting requirements—some S30 models require valve-regulated batteries for enclosed compartments.
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Beyond basic voltage requirements, the Clark S30’s battery compartment dictates precise sizing. The 245mm x 140mm footprint allows less than 3mm clearance tolerance. Did you know improper cell height (≤200mm) risks terminal contact with hood latches? Aftermarket options like Deka 12V35SL must replicate OEM-specific features: flame-arrestor vents and spill-proof construction for warehouse safety compliance.
| Parameter | OEM Spec | Aftermarket Compatible |
|---|---|---|
| Voltage | 12V ±5% | 12V |
| Capacity | 35Ah @ 20hr | 32-40Ah |
| Terminal Type | SAE automotive | Dual-post options |
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How does terminal configuration affect compatibility?
Clark S30 uses reverse polarity (positive-right) terminals with 16mm post diameter. Mismatched terminal orientation prevents cable reach, while undersized posts cause arcing. Pro Tip: Use dielectric grease on posts to reduce corrosion-induced voltage drops.
Reverse polarity layouts require special attention—did you know 78% of battery fires in S30s stem from reversed jumper connections? The positive terminal sits 85mm from the case’s right edge, requiring terminal adapters for standard Group U1 batteries. Vmax T-1275 models address this with extended positive leads. Warning: Forced installation of standard-polarity batteries risks shorting through chassis ground.
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FAQs
Yes, provided they meet 12V 35Ah+ specs and have proper venting. AGM models like Odyssey 12-35-6800 perform better in cold storage environments but require voltage-limited chargers.
How often should S30 batteries be watered?
Check electrolyte monthly—top up with distilled water when plates become exposed. Avoid overfilling beyond 6mm below fill wells to prevent acid spillage during charging.
