Quote:
Originally Posted by DonRotolo
Generally, AutoZone uses a conductance tester such as a Midtronics, and not like a carbon pile of the olden days. In other words, a LOT like the battery beak. These are very fast, lightweight, and accurate, and do not rely upon the user's skill. |
They may be accurate for what they do. But they do not measure the battery's capacity.
I have an old battery in my shed that passes with flying colors when tested with my "125 amps for 10 seconds" tester. But it fails miserably when subjected to a capacity test. So even if the high-load-short-duration test doesn't harm the battery, it doesn't really tell you what the true health of the battery is.
Quote:
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even a 150A load for 10 seconds will NOT damage an FRC battery. It's not good for this to be done on a regular basis, but 2 or 3 times a year is not harmful.
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Yuasa NP18-2 datasheet: Maximum discharge: 112 amps.
MK ES17-12 datasheet: Maximum discharge current for 30 seconds: 360 amps.
Go figure.