"Reggie Smithers" wrote in message
...


I might have been sold a bill of goods (this wouldn't be the first time),
but I was told by boat/us that the Marine Dual Purpose Battery would have
the extra "cranking amps" for a longer period of time, than a Deep Cycle
Battery would provide. I have twin 5.7 gas engines, which require high
cranking amps.

I had the same twin engines on our 32 footer and never had a problem using
deep cycle. I did, however, opt for three group 3 batteries. They were
large and heavy.

The batteries were on a constant charge when on shore power with a 20 amp
trickle smartcharger.

I never had a problem starting or running equipment while away from the
dock, including overnighters anchored or moored on a buoy.