Start from amp-hours, not CCA
Smart chargers are sold by output in amps. CCA and peak cranking ratings describe starting power, not charge rate. This site maps battery amp-hours to three verified VEVOR US smart-charger classes using required_a = Ah ÷ 10 (C/10).
Why C/10 on this screen
C/10 (about 10% of Ah) is a long-standing overnight lead-acid shopping rule of thumb. ChargeAmps uses it as a transparent starting point, then picks the smallest class on this ladder (8 / 20 / 35 A) whose rated amps cover that current. Example: 200 Ah → 20 A → 20 A class. It is not a BMS limit and not a welding procedure specification.
Chemistry, voltage, and polarity
Lead-acid, AGM, gel, and LiFePO4 packs need matching charger modes and correct system voltage. Ventilate while charging; observe polarity; manufacturer charge limits may differ from C/10. Comparison on this site is limited to the VEVOR US ladder shown here.
Safety rules this screen never relaxes
Confirm chemistry and voltage on the charger nameplate. Ventilate. Correct polarity. Manufacturer charge limits may differ. Ratings are manufacturer claims — verify the live listing. Affiliate tracking is pending. Product links are ordinary VEVOR merchant URLs; availability can change. A matched class is not a charge plan.
Class ladder on this site
ChargeAmps maps Ah to three verified VEVOR US smart chargers: 8 A, 20 A, and 35 A. Required C/10 above 35 A returns NO_MATCH instead of recommending an undersized consumer unit. Distinct from JumpAmps (engine displacement → peak cranking amp class). Sources reviewed include manufacturer amp claims on the linked listings checked 2026-09-10.