Well I have been doing some digging and the news (as I suspected) is not good.

The lowrance Mark 4 draws 0.25 a
The lowrance elite DSI 4 which I am so fond of draws over double at 0.75 a

Maybe some of you electronic types could help me out ( I basically failed DC fundamentals in college) If I were to run the DSI unit for 10 hours per day for 20 days how much juice would I need?

And the next question.......which one of these batteries would make the grade.
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And of course I am appreciative for the advice :thumbup