I have used LiFePO4 in radio control airplanes for the radio system batteries.
The LiFePO4 is very stable very little danger of fire if the battery is mistreated.
As said before a major drawback is the LiFePO4 has a very flat discharge voltage curve.Thus very difficult to determine if the battery is near its discharged state. They only way I know of is an accurate record of the volt amps used. There are instruments that can track the volt amps used.
Here is a device I use and has a 50 amp continuous rating. On draw back it has to be de-energized to reset the readings.
DC power meter