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Battery Load Test

  1. Disconnect and isolate both battery cables, negative cable first. Make sure the battery top and posts are clean.
  2. Connect a suitable VAT Tester to the battery posts. Check the open-circuit (no load) of the battery. Open-circuit voltage must be 12.4V or greater.
  3. Apply a 300 Amp load to the battery for fifteen seconds to remove the surface charge from the battery, then allow the battery to stabilize for five minutes.
  4. Apply a load equal to 50% of the CCA rating of the battery. After approximately fifteen seconds, check the loaded voltage reading, then remove the load.
  5. The voltage drop will vary with the battery temperature at the time of the load test.
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