Re: [MV] Mixing batteries

From: Thomas M McHugh (tmmchugh@msn.com)
Date: Tue Apr 29 2003 - 20:30:07 PDT


Bruce,

My batteries are parallel. The travel trailer is 12 volt. I have twin
batteries to give me more power for lights & water pump.

I shoot Civil War Weapons competitively & we camp out without any support
other than a generator to recharge after a few days usage.

Tom

----- Original Message -----
From: "Bruce Beattie" <bruce@eecs.berkeley.edu>
To: "Thomas M McHugh" <tmmchugh@msn.com>
Cc: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Tuesday, April 29, 2003 11:01 PM
Subject: Re: [MV] Mixing batteries

> Thanks Tom,
> I am assuming that you are using your batteries in series, or did the
> article talk about batteries that were charged in parallel as well?
> Also curious if anyone knows of some good technical sources on the
theory of
> battery
> chemistry?
> Bruce
>
> Thomas M McHugh wrote:
>
> > If you study the theory of batteries, you will find that paired
batteries
> > react to the level or power of the weakest battery.
> >
> > When you buy a pair of batteries & want the best service, buy a pair
from
> > the exact same lot. Even batteries made on different days can be a
lesser
> > than optimum match.
> >
> > Trailer Life Magazine had a great article a long time ago & repeated it
> > again a few years ago.
> >
> > I will probably jinx myself now, but, the pair of batteries in my travel
> > trailer are over 8 years old. Most dealers & battery companies say
that
> > 3 - 4 years usage is all you will get. OK now I will have to buy
> > batteries this year.
> >
> > Tom McHugh, NJ
> > 1952 M38A1
> > M-416 Trailer
> > MVPA, MTA
> >
> > ----- Original Message -----
> > From: "Bruce Beattie" <bruce@eecs.berkeley.edu>
> > To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> > Sent: Tuesday, April 29, 2003 7:58 PM
> > Subject: Re: [MV] Mixing batteries
> >
> > > Ok, I'll bite, Why would it make a difference if you use two different
> > > chemistries?
> > > As far as I know batteries don't talk to each other, so how on earth
can
> > they
> > > tell if the other battery is different.
> > > The electrical load on each battery is going to depend on the
application,
> > > and in 24 volt settups
> > > on CUCV's the loads and charging patterns are radicaly different from
what
> > I
> > > can see. Not that I am
> > > a guru about this sort of thing.
> > > Bruce MVPA 23824
> > >
> > > "Employee@MilVeh.com" wrote:
> > >
> > > > If you are replacing older 6TL batteries with new 6TMF
> > > > (or 6TLFP) batteries, it is desirable not to mix 6TL
> > > > with 6TMF/6TLFP in the vehicle/equipment. The older
> > > > 6TL cases are all green, including the top.
> > > >
> > > > The newer styles 6TLFP and 6TMF have black tops and a
> > > > green case or brown case. The reason is that the
> > > > chemistries are different. Bottom line: Its most
> > > > desirable to have "black tops with black tops" and
> > > > "green tops with green tops."
> > > >
> > > > If you need to know Army approved NSNs for other types
> > > > of batteries, like those needed for communications and
> > > > electronics, the Army CECOM-LRC website gives common
> > > > use batteries, both commercial and MILSPEC styles, in
> > > > their "Preferred Power Sources" listing.
> > > >
> > > > --- RKubu@aol.com wrote:
> > > > > List,
> > > > > I know there was a thread recently that covered
> > > > > mixing batteries. I cannot locate the messages and
> > > > > there is currently no list archive. Is it OK to mix
> > > > > 6TLs and 6TMFs? The latter look identical to the
> > > > > former and I was told they will work in a 5 ton.
> > > > >
> > > > > Thanks,
> > > > > Bruce
> > > > >
> > > > >
> > > > >
> > > > >
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> > >
> > >
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> > >
>
>



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