I doubt the Wee Go would work. The Opti has to turn over a couple of revolutions before anything happens, and it requires a lot of power to run the starter + the electronics. If you have a bad cranking battery, I would replace that before it bites you. If you have some sort of huge parasitic drain that kills the battery while you are out fishing, Id track that down as well. For emergencies, I have always just swapped the cables over to one of the TM batteries. Has only happened maybe twice in 40+ years of owning a boat.2008 Pantera Classic2014 Mercury Pro XS 200