hmmmm....very interesting on putting in dual batteries. My Porsche has two 12
volt batteries in parallel. It does need a lot of cranking power, as the oil
can get very thick when cold. I think the bigger reason for them is that they
needed to balance the car. They are placed as far to the forward corners as is
reasonable (i.e. better balance out for the rear engine).
Phil Bates
Jeff Fayne wrote:
> Found some interesting discussions on this very topic:
> http://www.jag-lovers.org/xk-lovers/library/batteries.html
>
> http://www.mv.com/users/tetrault/rv-tec.htm
>
> More than you care to know about batteries:
> http://www.ee.ualberta.ca/~schmaus/batlinks.html
>
> The short story is that while connecting two 12v batteries in parallel will
> give you extra CCA/capacity, you run the risk of overcharging one of the
> batteries (if charged in parallel) due to the fact that no two batteries
> have the same internal resistance/cell capacity. One will be inherently
> 'weaker' than the other and require a longer charge, essentially
> overcharging the 'stronger'.
>
> YMMV...
>
> Jeff
>
> ----- Original Message -----
> From: "Paul Nelson (artworks@bigfoot.com)" <ya632@victoria.tc.ca>
> To: "David Councill" <dcouncil@imt.net>; "Dave" <hearts@radiks.net>; "MG
> Digest" <mgs@autox.team.net>
> Sent: Saturday, December 23, 2000 3:03 PM
> Subject: Re: Replace the Twin Batteries or Not?
>
> > At 12:37 PM -0700 12/23/00, David Councill wrote:
> > >Personally, I always liked the uniqueness of the two 6 volts in series,
> > >plus the added power in the cold cranking amps. However, if you live in
> an
> > >area where it doesn't get below zero (F), the single 12 volt battery will
> > >work just as well and it doesn't involve any irreversible alteration in
> > >your car. You can always go back to the two 6 volts later if you are not
> > >satisfied.
> > >
> > >If you do go with the 12 volt, use the money you save and buy the plastic
> > >battery boxes first. They offer two advantages - one, you will be able to
> > >use one to insure the 12 volt battery will fit before you buy it (which
> is
> > >what I did at Sears). Two, you will have a nice storage compartment in
> the
> > >one empty battery case.
> >
> > I've never done it, but it shouldn't be that hard to connect two 12V's in
> > parallel to replace the two 6's in series and thereby REALLY increase the
> > cranking amps. Has anyone done anything like this? Any reason not to do
> > ilt?
> > Paul Nelson
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