Having spent 20+ years as an auto mechanic, I agree with Dave Plowman that
10 mA is fine.
Some of the cars that I have seen over the years could stand up to 40mA if
A few cars, mostly owned by proverbial "little old ladies",
required the installation of a smaller alternator pulley to keep the Battery
from going flat
my parents always had problems since they don't drive much and when
they do they take the small grocery getter. So my dads car would run
out of juice. I hooked him up with a battery tender / battery minder.
It keeps the batteries nicely topped off. He never has dead batteries
anymore and they last a lot longer.
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