Modern smartphones have improved battery management features like optimized and adaptive charging that make overnight charging safer than previously advised. While the fundamental chemistry of lithium-ion batteries still degrades with repeated full charge cycles, newer phones can automatically manage nighttime charging to reduce wear, though users should avoid excessive heat and consider setting lower charge limits if their usage patterns allow.
Stellantis has patented a fire-prevention system for Dodge vehicles that ejects the high-voltage battery pack from an EV during thermal incidents, then uses the 12-volt battery to move the car away from the now-detached burning battery. While more controlled than competitors' designs, the system leaves a hazardous lithium-ion fire in the vehicle's original location.