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Originally Posted by FJ40_owner  The DC battery plates cannot take the extreme high current draw. I am told it warps the plates.
My .02 |
I'm familiar with the battery designs and discharge rates for start and deep cycle batteries... but I've never heard about the plates on DC's warping? Where did you hear it? I'm not calling it into question, just curious about it. A good portion of my job is installing/replacing battery systems on boats and nearly all starting applications there use deep cycles (against my wishes). Smaller boats can crank up with a small marine start battery. But anything bigger than that really only comes in a thick-plate design (Group 31, 4D, 8D...). They see frequent loads at our above the 3-400A range from extended cranking and windlass (etc) use. I've never heard about DC plate warpage and would definitely like to know if it's an issue with smaller batteries!
That being said, I agree about the start battery being a better choice for starting/winching applications. When I get my dual-batt setup in my truck, it will have the starter and winch (not on the truck yet) tied directly to the start battery. The lights, stereo, nav, inverter will all be tied to a DC with a switchable parallel in between.
My experience with the dual-purpose Optima was good in my Rover: gave quick starts, but seemed to extend the discharge curve a little further than a start battery.
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Originally Posted by rusty_tlc I suspect that the dual use battery is a compromise between the two designs. |
I believe this is true. I'm trying to search the back of my mind, but I think they make the plates a little thicker than a start battery and a little thinner than a deep cycle. I don't think I've seen one cutaway, but I'm sure it is as rusty described it.