Two years ago I replaced both my lead acid trolling motor batteries with Dakota Lithium 12 V 100Ah. I have a 24v minkota Terrova 80lb thrust. I use the Minkota to steer my boat while trolling with a 9.9hp kicker and I can get at least 8hours of use at about 60% thrust. (based upon the charge time I think I had about 40-50% battery left)
In addition I decided to install a Dakota Lithium 12v 54Ah battery to run just my fish finder as I wanted pure clean power for the best sonar images.
This setup has been super !
The only issue I have had was with the 4 bank Dakota Lithium charger. It gets really hot when charging the three batteries I have. I have had to replace the charger three times due to one of the charging ports failing.
The charger and batteries are still on warranty and they replaced my charger all three times at no cost.
The support has been good each time I talked to them.

Hope this helps.
Andy