I used a Shorai LiFe battery for 4 years in my motorcycle before I put one in my RV6. Been in the RV6 for around 4 years now with zero problems. It weighs 4 lbs compared to the Odyssy's 16 lbs and cranks the Io360 with 9 to 1 compression a whole lot better. It is behind the firewall. Plan on using one in my Kitfox5 project. Probably have it on the engine side of the firewall. Like the suggestion of using an isolated box with an air vent.