Load Testing Your Battery
Use this same procedure for VRLA DRY CELL batteries and Flooded batteries:
- Recharge if the open circuit voltage is below 75%.
- If you have an adjustable load tester, set the load at 3 to 3.5 times the 20-hour rate.
- Apply the load for 15 seconds. The voltage should stabilize above 9.6 volts while on load.
- If the battery has a CCA rating, you can apply a load equal to ½ the rating for 15 seconds. The voltage should stabilize above 9.6 volts while on load.
- To apply a more determined test, you may apply a load equal to 100% of the rated CCA or 5 to 6 times the 20-hour rate for 30 seconds. The voltage should stabilize above 7.2 volts while on
- If below 9.6 volts (7.2 volts for the 100% CCA test), recharge and repeat the test. If below 9.6 volts (7.2 volts for the 100% CCA test) again, replace the battery.
There are many automated devices out that there that all good garages should have on hand that will run automated batteries tests (drop test) and print off SOH / SOC along with values so you can see the results. Many of this machines will also print off a report. Testing using this method is the most accurate way giving you results that will help you make informed choices.
