How to test a battery. Learn how to test a battery. How to use a multimeter to test a battery. What happens to the battery voltage under load. How to tell if the battery needs replacing. It is a simple tutorial the video goes over some basic steps that you can use to find out the voltage of some common batteries that you probably have lying around the house.
source/image(PrtSc): The Engineering Mindset
To test the battery, turn on your voltmeter, put the voltmeter on DCV and make sure that it is far above the battery voltage, on most voltmeters there is a setting “20” in the DCV area, so switch your voltmeter to that setting. Watch the video from The Engineering Mindset:
With the battery in front of you, put the red probe to battery’s nipple (+) and the black probe to the battery’s flat side (-). Notice the voltage reading on the voltmeter.
If the reading is more than 1.3V for alkaline battery (not rechargeable battery) then the battery still has some juice left in it, don’t throw it away. Otherwise, properly discard of the battery.Fully-charged AA, AAA, C, and D batteries have a charge of 1.5 volts. A 9v has 9 volts. If the charge is more than 1 volt below where it should be, then replace the battery./instructables