Connect the red lead to the battery’s positive terminal and the black lead to the battery’s negative terminal. Take note of the reading on the display of the multimeter. If you are testing a 6V battery a good battery will show a reading of between 4V to 6V. Anything less than 3.5V can show that the battery is dead and will need replacing.
If you mix up the leads, it won’t damage the battery. But the reading will be in a negative value rather than a positive one. Common household batteries won’t shock you during this test, so don’t worry. Hold the leads to the battery to get the volt reading. The meter will produce a reading within a few seconds.
There are many different types of batteries, and you can test all of them to see if they're charged or not. Alkaline batteries bounce when they're going bad, so drop one on a hard surface to see whether or not it bounces. Take an exact voltage reading with a multimeter, voltmeter, or battery tester to get an exact charge reading.
The reading on the multimeter indicates the instantaneous current being drawn from the battery by the connected load at that moment. This measurement reflects the battery's ability to supply current under the specific conditions of the test, not its total capacity (Ah or mAh).
As you can see from the image above the voltage was in the range of the specified voltage. The battery we tested was a 1.5V battery. Anything less than 1V, in this case, would indicate a faulty battery. When testing for the level of current you should follow the same steps after moving the dial to the correct location.
Reading in left red area indicates low voltage after charge due to a possible short in the battery. Reading in right red area indicates high voltage after charge due to sulphation or high battery resistance. Reading in the green area indicates a good battery. If recharging is necessary, the approximate charge time in hours can be read. 11.
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