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Thread: Why do car batteries go dead?
www.piclist.com/techref/power/batterys.htm?key=batteries
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face BY : Herbert Graf email (remove spam text)


On Thu, 2008-07-31 at 02:54 +0100, Tomás Ó hÉilidhe wrote:
> It's common knowledge that if a car's left sitting for a few months, the
> battery will be dead when you go out and try start it.
>
> Assuming no current's being drawn from the battery (because the
> circuit's broken), does anyone know why it goes dead?

Batteries have internal leakage currents, they will self discharge no
matter what.

Leave any battery long enough and it'll be empty.

Car batteries are optimized for large startup currents during cold
weather. Internal leakage is not a very important issue when they are
designed.

TTYL
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