Calculator

Battery charger amp class calculator

Enter battery capacity in amp-hours. Get the smallest 8, 20, or 35 A smart-charger class from C/10 starting current or NO_MATCH.

Result

Enter values to begin.

Required A ≈ battery_ah ÷ 10. Classes: 8 · 20 · 35 A. Worked check: 100 Ah → 10 A → 20 A class. C/10 is a shopping starting point, not a BMS/WPS.

Guides

C/10 vs BMS limits, chemistry, and polarity.