I had a charger once that had two switch positions for charging rate/terminal voltage and one of the positions was for deep cycle. Have no idea as to the chemical content, voltage/charging current requirements, or anything else other than they are made from (fewer for a given size) thick plates that can tolerate deep cycling more frequently and deeper than coventional thickness plates in lead acid batteries.
But don't think they can't pump some amps when they want to. I bought a used tractor a few years ago ( 70 drawbar hp JD 4010D) with a (1) size 27 deep cycle battery that was several years old and I used it for a couple more years at least and that battery could start that tractor year round. I couldn't believe it.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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