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Originally Posted by Jaxonalden
Amen Paul, I'd love to hear what the "We have seen several cars with this type of issue in our shop that had current draws less than one amp that killed a battery in an hour or two..." fix was. Less that an amp and killing a 800+ amp hour battery? Are they kidding? The math simply doesn't support that statement... and they run a shop?
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Yes, we
do run a very successful shop; and in the Northeast, where weather often goes into negative numbers, a battery with a couple of years of service on it can be pulled down enough by a low amperage drain to not be able to turn over a cold engine after a couple of hours in the cold.
While you are "checking your math", go to the BCI (Battery Council International) and check on how amp hour ratings tests are done and their actual relationship to and real-world problems effecting cold cranking performance. I would also suggest you consult Vinal's fourth edition of
Storage Batteries which has an excellent discussion on issues that impact the amp hour output efficiency in lead-acid storage batteries, paying particular attention to effects of aging and temperature...............
As for the fix, we isolated the problems circuit(s) using a digital multi meter and either repaired the problem, or if requested by the owner, disconnected the problem circuit, usually by leaving out the fuse.
Have a nice day………………….
