How do I load test my battery for my automatic driveway gate opener?

When batteries on your automatic driveway gate opener have read cells or are getting old they may read fine (13.5-13.8 VDC) at rest, but not be able to perform under a load. To test your battery under a load, keep the battery fully installed into the automatic gate opener system; attached both to the incoming power source and the automatic gate opener arm. Take the positive and negative leads from your voltmeter and place them on the positive and negative battery spades. Then run you automatic driveway gate opener through a cycle and see what the voltage of the battery drops to. A fully charged, healthy battery shouldn’t drop more than a volt.