That battery is $1,000! I know you've got to pay to play, but holy hell! Will any onboard charger work for it, given it is lithium?Get a single 24v 50ah lifepo4 battery and put your starting battery and tm battery under the console. Will get some weight out from the back and put it in the center. I’m assuming that your starting battery is in back.
I have two 100ah Battleborn batteries in the front and together weigh 62lbs. Have gone on four day trips and never ran out of power. They now make a 50ah 24v battery that weighs 31lbs and should give you more than enough juice for a long day on the troller. Ten year warranty is nice as well.