Another vote for a Minn Kota digital. I have a 3 bank that works flawlessly and a friend has used one for several years without nary a problem or issue. One thing to keep in mind, charging is only one part of keeping batteries at optimal levels. To insure years of trouble free battery life get a charger that conditions the batteries as well as charges. Batteries are not cheap, your charger is a critical part of getting the best from them.