Been hearing a lot about the new Lithium Ion technology and was thinking about replacing worn out stock battery in my WR. Checked into a website that was discussing the pros and cons. First advantage is they are approximately 1/3 weight and size I would guess of what I'm now running. They can be recharged hundreds of times. Two things I found that are of a concern, actually three, they tend to be more expensive, some on occasion burst into fire, and the clincher they need to be replaced probably at least every three years. I don't know this for a fact, but I certainly don't want to have the bike catch on fire and burn down the garage or attached house. I don't like the idea of spending more money on something that needs to be replaced that frequently and with minimal upkeep the OEM stuff will last nearly as long. Weight isn't that big of an issue anyway. The exploding/catching on fire thing is a real biggy, have you been reading about the VOLT?