How To Test A 9 Volt Battery Without A Multimeter. So before getting started well go over some things you need to know to test a battery. With a very small load a multimeter it puts out its nominal voltage slightly over 9 volts in this case.
With a heavier load an LED directly across the terminals or a motor the output voltage drops because the battery cant provide enough power for the heavier load. This makes them comparable to the old fashioned 72 Volt NiCd 9 Volt batteries. For your battery to pass a load test the multimeter must read between 95 to 105 volts straight for 30 seconds when the battery is tested.
With a heavier load an LED directly across the terminals or a motor the output voltage drops because the battery cant provide enough power for the heavier load.
This procedure shows you how to test a 12-volt battery with a multimeter. This was cheaper lighter and more portable than providing a battery holder for 6 AA batteries. If the battery is new and still alive and full of life the multimeter should read a voltage near the voltage rating of the battery. If it lands with a small thud back on the flat end and stays in place the battery still has a charge.
