This is what I run....Minnkota Precision Charger. Make sure you get at least 10 amp per bank, 15 amp is better.
Longer run times. Shorter charge times. That's the precision difference that keeps anglers on the water longer and puts more fish in the boat. Now, the next generation of this legendary line of chargers has been optimized for 12 volt lithium (LiFePO4) batteries. Precision chargers feature...minnkotamotors.johnsonoutdoors.com
What's the advantage of going with a lithium battery system? KirkI have a 2 bank Cabelas Pro series 12 amp charger for sake . Just posted it on Ifish . Take a look. used it for 3 years with my 24 volt Min kota . Works great ! I switched to Lithium , so I have no use for it anymore.