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From: Yvan on 14 Apr 2010 05:32
I have 20 years old 1.6 liter car that has good 45Ah battery, and
another car of the same age, that I rarely use, with 2.3 literengine
that, according to the manual, needs 65Ah battery.

Will 45Ah battery get damaged if I use it to start the other car? Can
big current draw damage it?

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From: Adrian on 14 Apr 2010 05:37
"Yvan(a)office" <me(a)privacy.net> gurgled happily, sounding much like they
were saying:

> I have 20 years old 1.6 liter car that has good 45Ah battery, and
> another car of the same age, that I rarely use, with 2.3 literengine
> that, according to the manual, needs 65Ah battery.
>
> Will 45Ah battery get damaged if I use it to start the other car? Can
> big current draw damage it?

The relevant figure is the CCA - cold cranking amps. That's how much the
battery can deliver in a burst. The Ah figure is how long it can deliver
a sustained load - 1A for 45hrs or 65hrs.

In practice, if the CCA isn't as high as the starter motor requires, the
starter will just churn slowly.
From: Rob Graham on 14 Apr 2010 05:55
On 14/04/2010 10:32, Yvan(a)office wrote:
> I have 20 years old 1.6 liter car that has good 45Ah battery, and
> another car of the same age, that I rarely use, with 2.3 literengine
> that, according to the manual, needs 65Ah battery.
>
> Will 45Ah battery get damaged if I use it to start the other car? Can
> big current draw damage it?
>

A big current draw causes the battery to heat up. If it's a very big
current and sustained the battery may get damaged. But this is unlikely
in normal use. I would expect both a 45ah and 65ah battery to heat to
more or less the same extent, but provided there's no damage done the
bigger battery will simply provide a current for longer.

Rob Graham
From: Yvan on 14 Apr 2010 06:02
Nedavno Adrian napisa:

> In practice, if the CCA isn't as high as the starter motor requires,
> the starter will just churn slowly.


But the battery will not be damaged, right?
From: Duncan Wood on 14 Apr 2010 06:03
On Wed, 14 Apr 2010 12:02:32 +0200, Yvan(a)office <me(a)privacy.net> wrote:

> Nedavno Adrian napisa:
>
>> In practice, if the CCA isn't as high as the starter motor requires,
>> the starter will just churn slowly.
>
>
> But the battery will not be damaged, right?

Not if you've got any mechanical sympathy at all. Basically if it'll start
it (presuming they're the same voltage) it'll be fine.
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