Just got back from the Bike Show where I talked with a factory rep about the Shorai LFX lithium-based batteries. The literature claims they will hold a charge for one year without maintenance, have 2-4 times the service life of lead-acid batteries, and this I can vouch for because I picked one up, they are one-fifth the weight of a lead-acid battery. The model that fits my '99LT costs a cool $189 at their website, www.shoraipower.com. Anyone have any experience with these? It's time for me to swap out my Yuasa before the riding season starts.