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Using 100 amps battery tester

This is a discussion on Using 100 amps battery tester within the Talk Car forums, part of the Tech Support Forum category. I am interested in buying a 100 amps car battery tester . Are they worth buying and accurate enough to

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Old 07-29-2017, 08:33 AM   #1
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I am interested in buying a 100 amps car battery tester .
Are they worth buying and accurate enough to test health of the car battery ?

Using 100 amps battery tester loader to test health of a car battery.
Does one need to fully charge your car battery before, in order to do this test in order to get an accurate reading ? And you do the test when the car is not running right ?


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Old 07-29-2017, 08:53 AM   #2
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if your battery isn't properly charged it may not give out enough amps to be able to check it!

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Old 07-30-2017, 09:08 AM   #3
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Old 07-30-2017, 09:20 AM   #4
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Most dealers load test a battery as part of an oil change. IMO, replace a battery before you get stranded. After 5 years you're on borrowed time. If you must buy the device, be very careful when using it.

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Old 07-30-2017, 09:28 AM   #5
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Those old toaster style testers are not as accurate on newer 500 + amp batteries, same goes for the alternator test it will overload older units while underloading newer high amp alternators. You can get better results using a digital voltmeter and the starter motor to load the circuit.

Electronic testers used in most auto shops today are more accurate and give a better indication of battery state for marginal batteries but out the price range for most home users.
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