Even though you are testing a 12 volt battery you should know that a battery that is truly 12 0 volts is a boat anchor.
Motorcycle battery voltage at rest.
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A fully charged 12 volt battery allowed to rest for a few hours or days with no load being drawn from it or charge going to it will balance out its charge and measure about 12 6 volts between terminals.
If a battery reads 12 volts at rest it is almost fully depleted.
What voltage should my motorcycle battery read.
Start the engine and check the voltage while doing so.
The primary battery voltage is dictated by the chemistry of the lead acid cell.
The resting voltage should be approximately 12 5 volts.
Fully charged and in peak condition each cell has a voltage across it s terminals of 2 1v.
Once a battery drops below 12 4 volts your bike will struggle to start and at under 11 8 volts 12 volt batteries are considered to be dead.
The following table shows how battery voltage corresponds with state of charge at 80 degrees f.
If my battery dies can i recharge it.
When a battery reads only 12 volts under the above conditions it s almost fully depleted.
A healthy 12 volt battery should ideally register around 12 7 12 8 volts at rest but anywhere between 12 5 13 5 volts indicates a serviceable battery.
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For example a fully charged battery at rest should be between 12 6 and 12 75 volts.