Form factor smaller than 1865 with energy dense formula is rare. Chinese made LFP but only a handful of mfgs make them anymore. So size doesn't matter, but it basically matters :D
LFP is going to be manufactured in north america soon
Nothing except flashlights and yard lights seem to use them either. Probably because they're not exactly safe enough for frequent swapping applications, consumers will drop them on their tin foil crack smoking rig and make a fire or something.