I'm not sure if you're "gaining anything" on an RSV with a LI battery. The cyclist I've know to use them were for custom builds where they needed small (& light) packaging without a spill aspect to hide the battery. They were more expensive and required a specialty charger to use. There's nothing light weight or needing a small space in an RSV that would need that specialty.
Well, I was in Irvine CA for the wildfires (actually for work not for the fires) the 1st half of the week and came home to Houston in the low 30's. No snow though. That was a reason why we left northern Ohio.
Well right now, it is just plain cold. No snow on the ground but staying below freezing temperature for an extended period of time is taking a toll on my riding plans.