The battery can overheat during DC fast charging sessions, increasing the risk of a fireNissan is recalling nearly 20,000 Leaf EVs over a fire risk. Software update is in the works, but stop fast charging now. According to the National Highway Traffic Safety Administration, the lithium-ion pack can overheat when using DC fast charging. More: Nissan Takes A Leaf From The Z For Its Redesigned Mass Market EVWhen DC fast charging, the increased electrical resistance can result in “rapid heating of the battery.” If charging continues, a fire could occur. A second notice will follow once the software is ready, at which point vehicles will need to be taken to a dealership for the software update.