The Eray owners manual states that you must put a charger on the 12V stater battery if the Eray sits for more than a week. The battery charger for a Lithium battery is not the same as a regular lead acid one, its a higher voltage. The option part number for the Eray charge is the same as the lead acid one. Is there a new charger for the Eray coming? Sounds critical if you have to keep the 12v starter lithium charged this often.