Yep - Choochoosnake dood and Rob nailed it. And I failed to mention that I am still using a wet acid battery for my cranking battery (2018 Optimax 2-stroke). When I have everything set, the only things drawing juice from the cranking battery will be the big motor (starting), pumps/recirc, and running lights. I won't have to worry about sonar units draining my starting battery. The key here is demand - FFS and the new generation sonar units use a LOT of power. Lithium gives you improved endurance and performance from a charge cycle.
Choochoo - I chose Dakota. Their products had the best rating (and customer survey results) for cold weather performance. Ol' Airborne fishes a lot during the cold months.
