Lee,
Deep cycle batteries like to be drained on a regular basis, but slowly  
either by lights, stereo, etc. They do not like instant heavy draw like a  starter 
motor. It will work, but you will shorten it's life. Starter batteries  are 
designed for short deep draw cycles such as a starter motor. Starters draw  an 
unbelievable amount of amperage when first engaged. As they spin, the  amperage 
use drops.
 
Rummy......I'm still going with the starter  solenoid.



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