Safe here doesn't mean "can't kill you". Instead it means this chemistry doesn't exhibit thermal runaway (http://batteryuniversity.com/learn/article/lithium_ion

Safe here doesn't mean "can't kill you". Instead it means this chemistry doesn't exhibit thermal runaway (http://batteryuniversity.com/learn/article/lithium_ion_safety_concerns http://batteryuniversity.com/learn/article/lithium_ion_safet...)