i'm looking at possibly replacing the starting battery in my boat. it looks like all of the electronics (minus the trolling motor) are wired to that battery. currently there is a minn kota dual purpose battery being used. i have a 225 opti thats being started with it. everytime i start the motor, the low voltage indicator on my fishfinder will go off. i'm also looking at getting a humminbird 997sic soon, so that will take a decent amount of juice too, more then the black and white one i currently have. do any of you guys have any recommendations? any ideas on whats the smallest battery i can use? not that i'm going to go with the smallest, just so i don't make a bonehead move and accidentally get one. any and all advice would be greatly appreciated 
