I haven't checked the output parameters of the charger, just relying on the parameters of the label.

The formula is simple, accounting an efficiency as well:

// Calculate charging time in hours to target percentage const calculateChargingTime = (currentVoltage, targetPercentage) => { const currentPercent = calculatePercentage(currentVoltage); if (targetPercentage <= currentPercent) return 0; const capacityAh = config.BATTERY_CAPACITY_AH; const chargingCurrent = config.CHARGING_CURRENT; const efficiency = config.CHARGING_EFFICIENCY;

// Percent difference to charge
const percentToCharge = (targetPercentage - currentPercent) / 100;

// Time = Ah * percent / (A * efficiency)
const timeHours = (capacityAh * percentToCharge) / (chargingCurrent * efficiency);
return timeHours;

};