How To Check Battery Ah With Multimeter. If a battery is not putting up with the desired performance it is supposed to deliver it can be tested with a multimeter. Thus it can either be measured in terms of amp-hours Ah or milliamp-hours mAh.

This voltage is called open circuit voltage. Make connections as shown. I believe its a lead acid battery.
How to Test Lithium Ion Battery Capacity-Testing and Care.
Here is other article for multimeter understanding. Its a good idea to write down the reading. How to Check Your Car Battery with a Multimeter. Which unit would best suit to test the car battery with a multimeter depends on the size of battery.
