New to this, anything wrong with inserting the battery at home, sticking it on the rack and driving to the trails, versus inserting it at the trailhead?
I don't have a choice on the Rise, it's integral and non-removable. The Meridas we have are all battery-less on the carrier with the batteries in the car. Partially to keep them warm and partially to make it less valuable if stolen...
I almost never remove the battery from the bike. Keeping the battery in place keeps water and crap off the contacts and out of the lock mechanism. If you remove the battery you'll need to have some sort of protection from the elements.
Also if there is a LiPo fire I want it outside the car not inside with me.