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Checking Charge State Of An AGM Battery Using A Battery Tester

  1. Check the battery charge state according to the operating instructions for the relevant rapid-start battery charger or battery tester.

Evaluating the test results and subsequent procedure: 

Open-circuit voltage in volts Charge state in % Evaluation and procedure
12.7 - 12.5 100 - 80 Charge state OK
12.5 - 12.2 80 - 50 Charge state reduced, recharge battery and observe an inactive period of two hours after charging.
12.2 - 11.6 50 - 10 Battery flat; recharge battery and observe an inactive period of two hours after charging.
below 11.6 below 10 Battery totally discharged; replace battery.
270619 REMOVING AND INSTALLING BATTERY