I'm setting up a new pair of Cannon MAG5HS electrics(only Big Jon manuals before)and only other electrical draw(for now)is my fishfinder/gps combo. I have a tired 4 year old Can.Tire deep cycle that I want to replace. I'm looking at an Interstate SRM-29 (group 29)deep cycle. It has 675 CCA, 845 CA, and a huge 210 minutes of reserve capacity, for about $140.95. I'll be the first to admit I'm into new territory here, so any help would be appreciated. Thanks in advance folks. Big Guy.