Join Date: Oct 2012
Location: Upstate NY
Bikes: Giant Defy 1, and some others
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Lithium ion battery is kind of a broad term. There are a lot of different designs, different chemistries, different levels of quality. A lot of factors effect how safe a battery is, and how well its going to perform. But, all lithium ion chemistries are more unstable than, lead acid, nickle cadmium, alkaline, etc. All you can really do is stick with batteries of good quality, and retire any batteries that show visible signs of damage.
And, I wouldn't leave one charging overnight in my home, or while I'm not home.