kingfish,just like fishin lines,theres a ton on the market,charging depending on battery temp and voltage, for what its worth i have had Guess chargers on my skeeter and my sprint boats,currently own a stratos and it has a Dual Pro, have had no problems with either of these brands,do recommend though including your cranking battery when you purchase a charger for your trolling motor batteries,plug it in and forget it! good luck