Just a week ago I was at a friend's auto shop and asked if they had a battery tester. I tried his compact battery tester he has and the battery life is 66% which is not bad for a four year old battery. The one he has doesn't do a charging system test or start test. The reason I bought the KZYEE battery tester is that it does all three tests: battery charging, charging system and starting test. The battery test almost reached the displayed percentage with 2%. The instructions are easy to follow, just take the time to read them. The menu is easy to use and the settings are easy to make.
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