Re: Battery drains after a few days - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
 
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post #1 of 2 (permalink) Old 06-14-05, 12:27 AM
Bingo
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Re: Battery drains after a few days

I had a similar problem a few months back - newish battery going flat, not
much drain.

It turned out that it WAS the battery - it was not holding charge on one of
the cells, and would go flat if I left the car for 2 days.

If you have a voltmeter, check the voltage when it is drained. In my case it
dropped from 12v(-ish) to 10v(-ish)
I don't remember the real figures, but it was clear that it had dropped by
one sixth (=1 cell).

Anyway - do NOT discount the battery (can you borrow one from another car
??)


Good luck

Bob


 
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post #2 of 2 (permalink) Old 06-14-05, 12:28 AM
Pi
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Re: Battery drains after a few days

On Thu, 2 Jun 2005 17:54:59 GMT, "Bingo" <bingo@bongo-zz.com> wrote:
>If you have a voltmeter, check the voltage when it is drained. In my case it
>dropped from 12v(-ish) to 10v(-ish)
>I don't remember the real figures, but it was clear that it had dropped by
>one sixth (=1 cell).
>Anyway - do NOT discount the battery (can you borrow one from another car
>??)


A 90% charged battery (=full) is 13.8 Volts. With a short-circuited
cell 11.5 Volts.
Pieter
 
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