How long will it take a 1.5amp charger to charge 12volt?

The charging time for a 12-volt battery depends on its capacity, typically measured in amp-hours (Ah). To estimate the time, you can use the formula: Time (hours) = Capacity (Ah) / Charging Current (A). For example, if you have a 12V battery with a capacity of 10Ah, it would take approximately 10Ah / 1.5A = about 6.67 hours to fully charge, assuming no losses.