They're lithium-ion batteries, which contain very little elemental lithium and do not result in lithium fires (which are very difficult to put out). True lithiu

They're lithium-ion batteries, which contain very little elemental lithium and do not result in lithium fires (which are very difficult to put out). True lithium batteries (the kind that can cause lithium fires) are not rechargeable. http://batteryuniversity.com/learn/article/safety_concerns_with_li_ion http://batteryuniversity.com/learn/article/safety_concerns_w... [edited to add link]