Hey, I appreciate the responses from each. One of the great things about this forum is the exchange of ideas so thanks to each of you.
Cal, do you have a specific model # you recommend? On Amazon, I'm seeing a bunch of different ones/sizes and I don't mind paying for the Shorai battery tender to go along with the battery. On both of these, size is going to be an issue and I don't want to force the kid into kick start only at this point. We may later decide to go that route but I'd like to have the starter available if he wants to go the electric start route.