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Re: 6V battery

Subject: Re: 6V battery
From: (Robert J. Donahue)
Date: Fri, 4 Jul 1997 00:58:04 -0600 (MDT)
>In a message dated 97-07-03 19:56:35 EDT, (Wayne Kube)
>>  But, if you're *really*
>>  serious about more cranking power, put 2 twelve volts in parallel.  You
>>  still end up with 12 volts, but the amperage will be doubled.  Just make
>>  sure the batteries are identical for proper charging.
>This is an invitation for disaster! I agree with you, that as long as both
>batteries are identical, everything is OK, and you have twice the charging
>current. But what happens when one battery goes bad (and sooner or later, one
>will)? The good battery will now act as a battery charger to the bad battery.
>With nothing but the internal resistance of the battery to limit current,
>there is a real probability of a melt down.
>As for the use of parallel batteries in trucks, are you sure they don't use
>some type of isolation scheme, such as the use of rectifiers, to prevent
>this? I would be interested in learning more about this.
>Dan Masters,
>Alcoa, TN
>'71 TR6---------3000mile/year driver, fully restored
>'71 TR6---------undergoing full restoration and Ford 5.0 V8 insertion - see:
>'74 MGBGT---3000mile/year driver, original condition
>'68 MGBGT---organ donor for the '74
As far as I know, it is safe to connect lead acid batteries of the same voltage
in parallel, and it is common practice. They don't even have to have the exact
same amp-hr rating. Every time you jumper a car battery you're connecting two
batteries in parallel. Now nicad batteries are a different matter, never connect
nicads in parallel.

Bob Donahue, Still Stuck in the '50s           
52 MG-TD #17639 under DIY restoration, NEMGTR #11470
71 MGB still in shop, 19 months and counting

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