I have two electric Scotty DR's and run two batteries. I have everything wired in together. My kicker does charge. I set my selector switch so I'm running one battery one day, then the other one the next. I always have one that is fully charge and ready to go that way. Never noticed the Scotty's wearing the charge down at all, even at Sekui where there is a fair amount of up and down. In addition, I run a medium sized sonar, GPS, and VHF along with the running lights.