Come to find out my 2 bank charger for my trolling batteries isn't working correctly,,, 1 bank now fails to come on and the other never fully charges,mm it's an International prochargers and from I'm told they are wayyyyy under powered for the 31m batteries,,,, it's only a 2 bank 10 amp charger and from I'm told that the sears 31m platinums need at least a 40 amp charger,,, so In now looking at the Sterling procharge ultra which carries a 5 year warrenty and costs less them most any 3 bank charger out there at only 320 dollars,,