I always thought (like this guy) that putting out a Li-Ion battery fire with water was a bad idea because of the reaction between water and lithium.
Lithium-ion batteries contain little lithium metal and in case of a fire they can be dowsed with water. Only lithium-metal batteries require a Class D fire extinguisher.
Is this accurate? Can I really use water on Li-Ion battery fires?
And if so, is this safe for batteries of any capacity, or is it dangerous beyond some mAh?