In 2010, UPS Flight 6 in Dubai was brought down by a fire that started in a pallet of Lithium Ion batteries.
https://en.wikipedia.org/wiki/UPS_Airlines_Flight_6
The article claims that there’s one incident per week for these passenger-owned device fires on commercial flights. When they happen in the cabin it’s spectacular and terrifying but the bigger worry is when a fire smolders out of sight.