How to Test a Battery

This video demonstrates how to test a battery for proper voltage before replacing it.


  • Voltmeter that can test DC Voltage

In the video, the battery is outside the unit, though a battery test is possible while on or off the machine.

Testing a Battery:

  • You will need a meter that can test DC voltage
  • There are many possible battery ratings such as 6 VDC, 8 VDC, and 12 VDC.
  • Ensure that your meter is equipped with a compatible DC volt range for the battery being tested.

For the video, we used several batteries with different ratings. All batteries were rated less than 20 volts, so the meter setting of 20 VDC used worked for all our examples.

  1. Set your meter to volts DC and auto range. Or, manually set it to a DC volt range proper for the battery you are testing, depending on your meters options.
  2. Touch the red lead of the meter to the positive terminal of the battery.
  3. Touch the black lead of the meter to the negative terminal of the battery.
  4. You should get a reading very close to the rating of the battery. If you get a reading below the rating of the battery, the battery should be charged and re-tested.
  5. If the battery still shows a reading below its rating after being charged, it should be replaced.
  6. Once you verify you have a good battery you should test the charging system of the unit.
  7. Testing the new battery while the unit is in use will prove the functionality of the charging system. Of course, this is not possible on all units for safety reasons.


Make sure that all parts of the machine are clear of obstruction. That you and your meter are clear of all moving parts while performing the voltage test. It may be necessary to remove some shrouds to ensure the safety of the unit and the persons involved.

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