You want to add a deep cycle battery to power accessories. The starter
battery should be used for just that purpose. In a pinch, the deep cycle
battery will probably start the boats you have listed as well. The proper
switch is a must, and an automatic charging relay will make your life very
simple.

--Mike

"sonofadocker" wrote in message
oups.com...
can anyone tell ma how to use to batteries for my boat.
i would like one to run the motor only.
one to run all the radios,lights etc.

thanks

sonofadocker

1980 wellcraft cc 85hp
1975 sportcraft cuddy 150hp