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â Battery TestÂ With battery type and standard selected, Roadi 12V battery tester will more accurately test the whole condition of your battery includingÂ battery capacity CCA (Cold Cranking Amps) value,Â battery life remain%, battery real-time charge and discharge rate%, real-time voltage and internal resistance value.Â â Cranking (starter) TestRoadi battery testerÂ will also quickly and accurately test theÂ cranking voltage and cranking time.Normally the cranking voltage lower than 9.6V is regarded as abnormal.Â If cranking voltage is too low, the battery may become weak.IfÂ cranking time is too long, check the oil and engine.â Charging System TestRoadi Battery tester can not onlyÂ test alternator charging voltage (load/unload status), but can testÂ the healthy status of rectifier diodes.Â Normally the maximum charging voltage varies in 14.7+-0.5V.Â Â Diodes’ ripple voltage varies in 0~200mVIf charging voltage is too high or low, check the regulator ( more info in the user manual)Regularly test your charging systemÂ to prevent the battery from overcharging or discharging, effectively protecting the battery and increasing battery life.âWarm tipsRoadi Battery tester suits for customers from beginners to experts for its easy operation, accurate test result, andÂ 15-page detailedÂ user manualÂ withÂ comprehensiveÂ instructions and result analysis.With protective case, you can safely take or store the tester anywhere you want. with LCD backlit screen, you can see the data clearly even in the dark. With USB cable and CD driver attached, you can print the test data if you want to.Most importantly: please also contact Roadi via Amazon if you have any question about testing car batteries. Roadi has its own R&D team and mechanics for answering all your questions