They wouldn’t work and would likely puff up due to the high load. Buy LiPos, they are safe when used and maintained correctly. LiFe batteries are for transmitters and modded nerf guns mainly.
The C rating on LiPos are overstated 99% of the time, there are no true 50c LiPos, the 25c LiPos will work perfectly. I do recommend CNHL LiPos though.
Welcome to the forum! LiFe batteries won’t work as they have a lower voltage and discharge rate compared to LiPos. In my experience, LiPo batteries are not as dangerous as people make them seem, take care of them and maintain them and they will be safe and fine, and buy a Bat-Safe to store and...