Re: [T3] Dual batteries

["Jim Adney" <jadney@vwtype3.org>]

On 5 Dec 2000, at 9:56, Bob in Houston wrote:

> Without going into all of the usual equations of lessened battery
> internal resistance, dissimilar charging rates, etc......... Does
> anyone out there actually have experience with paralleling two 6 VDC
> batteries (BCI size 19L) so as to obtain a higher overall ampere
> rating than obtained by a single, physically small, 6 VDC battery?

I think it will work just fine.

> Again, has anyone actually done this, and, if so, what were the
> results ?

I have done this for years with 12V batteries. It enables me to 
squeeze the last drop of life out of my batteries. Doing this, I 
usually get about 7-8 years out of a battery, which isn't too shabby 
in the climate where I live. It was +3F here this morning and winder 
is just getting started.

The only down side is that once a cell shorts in either of the 
batteries, it will discharge the other one, too, but that doesn't wreck 
it, just leaves you stranded for a short time.

For the second battery, I use a second OE ground strap and a 12V 
"jumper" that I made from an OE + cable, modified so that it can 
be connected to the + post on the "normal" battery.

-
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054

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