On Apr 4, 7:53?pm, "Mike" wrote:
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


If rated for sufficient amperage, a "deep cycle" battery will do a
dandy job of starting the boat.

Odds are that even with careful management, the "starting battery"
will become accidentally discharged every so often. The light duty
construction of a cheapie "starting" battery won't stand up to very
many recharges before the plates start crumbling.

Better to get two deep cycle batteries, both of them rated for enough
amperage to start the boat, and use one for house and reserve the
other for starting.