Wrong, Chuck. The starting batteries can supply more current over a shorter
time. Total amp hours can be the same. Those thinner / more surface area
plates allow the high current loads. Is the main difference between
starting and deep cycle.
Bill

Only partially right, Bill. If you compare small, cheap, batteries it's true.
Going up a size with a deep cycle delivers more than enough power to start an
engine.

What aspect of electricity do you maintain can only be adequately supplied by a
battery with a "starting" sticker on the case? Amps? Volts?

The top rated battery companies don't even offer "starting" batteries in 12
volt sizes. (They do offer 8 volt starting batteries for wiring up 24 and
32-volt combos for cranking monster engines) Check it out.

http://www.dcbattery.com/rolls.html

Completely right. The non-small, non-cheap batteries, are not even rated as
a starting battery. Is just a very big source of electrons. An 8D etc. are
different than what most batteries you find in most boats. Most boats are
not 30'+ cruisers, they are O/B and I/O powered runabouts. No house bank,
but on a bass boat a couple of deep cycle batteries for the trolling motor
and a big starting / deepcycle (group 27) for starting and running the
livewell. And these are very susceptible to the different current loads.
An 8D / 6D is called upon to supply power for 1kw microwaves during anchor
time. Therefore they are required to be large current sources i.e. Low
internal resistance. But they also may weigh 200#, as opposed to the 40#
for most batteries in those runabouts.
Bill

"Gould 0738" wrote in message
...
Wrong, Chuck. The starting batteries can supply more current over a
shorter
time. Total amp hours can be the same. Those thinner / more surface
area
plates allow the high current loads. Is the main difference between
starting and deep cycle.
Bill

Only partially right, Bill. If you compare small, cheap, batteries it's
true.
Going up a size with a deep cycle delivers more than enough power to start
an
engine.

What aspect of electricity do you maintain can only be adequately supplied
by a
battery with a "starting" sticker on the case? Amps? Volts?

The top rated battery companies don't even offer "starting" batteries in
12
volt sizes. (They do offer 8 volt starting batteries for wiring up 24 and
32-volt combos for cranking monster engines) Check it out.

http://www.dcbattery.com/rolls.html