I think most if not all these drop in lithium batteries are now lithium iron phosphate .... If it's not, don't use it. Those early lithium ion batteries gave lithium a bad name when they burned up boats. Those cell phone batteries that catch on fire are lithium ion.
With the lithium iron phosphate chemistry it is virtually impossible to have a thermal runaway situation.
One of the problems is that some of the people selling them use the terminology interchangeably. They will call it a lithium ion .... when it actually is a lithium iron phosphate.