Every engine manufacture states in their installation guide specifically to NOT use deep cycle batteries as a starting battery. Deep cycle batteries are for trolling motors and battery banks. A starting battery will run all your electronics and them some. Using a deep cycle battery for electronics comes from the car stereo guys(oddly enough, they will do better with a starting than DC) and has no merit. I sell quite a few batteries each year and can tell you, all batteries are not the same. The Deka 24M7 is probably the best battery out there right now. You can use a deep cycle battery to start an engine, buts its not the best battery to use. Use of an incorrect battery can effect your engines warranty as well. Mercury has gotten very specific about it with their outboards
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