With most outboard boats, though, you may be out of luck. In the old days, you pulled off the cowling and removed the coiled-up starter rope the manufacturer provided, then attempted to pull-start the engine. That was always fun, especially with a V-6. (Did you ever notice that the pull rope was always a little too short to do the job?) Nowadays, the new generation of computer-controlled outboards can't be pull-started, and the computers themselves demand a fairly high level of voltage to start the engine. You need more juice than ever.