Methodology guide
Limits, 12V polarity rules, and when to stop shopping this ladder.
Calculator
Jump starter size by engine liters
Enter liters and fuel (1=gasoline, 2=diesel). Get a 1000 / 1500 / 4000 A peak class or NO_MATCH. 12V only; correct clamp polarity; charged pack; PPE.
Result
Worked checks: 2.0L gas → 1000 · 5.5L gas → 1500 · 8.0L diesel → 4000 · 12L gas → NO_MATCH. classLbs uses peak-amp class ids for CTA matching.
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