I think you can find them on ebay for about $60. I’d recommend an old fashion carbon pile tester. Models similar to the one Eric uses start fairly cheap and are reliable. I’ve had expensive digital testers give false results on batteries that will immediately pass a carbon pile test. The best way to check a battery is still with a carbon pile tester similar to the one Eric uses in his videos. They may also provide a code for the failed test. Shops like the digital tester because most of them will give you a print-out of the reading and in cases where warranty applies. It’s really nothing fancy, but it allows me to check battery condition, starting voltage and charging voltage quickly with one small tool. I have a small Mac unit I got with a charger that’s nice for quick assessment. You can buy digital testers from $100 or so, up into the thousands of dollars. Even then a lesser DVOM may not show the lowest voltage drop, unless it has a function to ‘capture’ the value. The only way you can really test with voltage is to monitor what the voltage drops to during cranking. Measuring voltage itself does very little to show the health of a battery.
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