I just purchased a 2013 SmartCar electric and I love it! I want from golf cart to Bombadier (same size as smart and looks very similiar) to a GEM to this SmartCar. Oh btw I still have the GEM and it's for sale...another topic though. I was wondering when should I charge this? The other carts had lead acid type batteries and they like to be fully charged. I understand however that the Lithium battery pack when fully charged is 'stressed' and they don't like that. So do I just charge when it gets low? and how low (again lead acid doesn't like to be really lowly depleted so I would run down no lower that 60% and I always changed every night no matter) is low. Does it damage the battery pack to run down to 30% or so or do I use the mentality of not running down too low (like lead acid)? Currently I am running down to approx 40% or so and then making sure I drive it a little after a full charge (relieves the stress factor?). Thoughts? Suggestion?