What Voltage Should A 12v Battery Read. A 12-volt battery is a term used to distinguish between different types of batteries. If the battery is good the reading should actually be higher than 12 volts.
Check the reading. Resting fully charged 12-volt batteries are around 128-129 volts and flat dead ones are at 120 volts so 124 volts on a resting battery means its about 50 charged. We call this the open cell.
The chart is listed below.
If your battery volt read is more than 128 like 129 or 13 then your battery is excessively charged. Voltages and Specific Gravity are listed for a 6-volt or 12-volt battery and battery banks of 24 and 48 volts. Percentage of Charge 12 Volt Battery Voltage Specific Gravity 100 1270 1265. If the battery begins to hold and then steadily declines there is a problem.
