On Sun, Jun 28, 2009 at 10:54:29PM -0400, ahmet erkan wrote:
> There may be some issues connecting a discharged battery in parallel with a
> charged one.

That shouldn't be a problem: as soon as you connect the two, assuming
the wire gauge is large enough, the voltages will immediately begin to
equalize - and given that the charged battery voltage will be dropping
while the discharged one is rising, the current flow between the two
will shortly drop to a relatively low level.

Of course, if (e.g.) the engine is running at the time, then there will
be essentially zero current between the two anyway.

> Small gauge wire at the proper length with high temperature
> insulation might limit the current to an acceptable level.

In my opinion, small gauge wire doesn't belong anywhere near a charging
circuit: please consider what would happen to that wire if the battery
was discharged and you fed it the full alternator output. FWIW, I often
use my alternator as a welder, and it happily turns 1/8" 'wire' (a.k.a.
welding rod) into a red-hot glowing liquid.


-- 
* Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *
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