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