Some exciting news with lithium batteries. Optima is releasing a line of them for power sports. Might be a good option for the ftr.
OPTIMA Introduces Its First-Ever State-Of-The-Art Lithium Battery & Groundbreaking Features - UTV Sports
OPTIMA Batteries, a leading brand of Clarios, debuted two Rivian EV overland builds at the 2022 SEMA Show to charge the off-road enthusiast EV market in collaboration with DCE, a new EV product line by Weistec Engineering.
utvsportsmag.com