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Tractor Talk Discussion Forum

Re: adding batteries together?

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Indiana Ken

01-14-2014 17:23:29
66.249.234.135



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Yes, when you add cells the internal resistance of a lead acid battery typically increases. However, the 12 volt battery (6 cells versus 3 cells for the 6 volt) starts out with a higher resistance. Some manufactures list the internal resistance along with the other battery data. I am looking at the spec sheet for Optima Batteries: a 12 volt battery with 800 CCA has an internal resistance of 0.0030 ohms which compares to their 6 volt battery with 800 CCA with an internal resistance of 0.0019 ohms.

Since the effect is rather small (0.0030 versus 0.0038) a pair of the 6 volt batterys could be an option if the price is right.

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Texasmark1

01-15-2014 05:27:01
172.242.14.143



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 Re: adding batteries together? in reply to Indiana Ken, 01-14-2014 17:23:29  
Well, I am more concerned with the midlife resistance when the battery starts sulphating up and the exterior wiring is getting corroded up sort of thing. Just using the logic of resistors in series vs in parallel and the miniscule circuit resistance that can be tolerated and get a good start.

I didn't check the resistance on the 6 volt batteries, nor the old circuit wiring when I replaced them, but I guarantee you the new setup made one whopping difference.

Mark

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