Thinking of throwing some cash out on one of those cheap lifePo4 lithium batteries.

Price ranges seem to be around $850 - $950 for a range of 12v 100Ah batteries, then they drop down to around $500, most likely chinese seconds I guess.

Why am I looking at these? Well I need a new battery for a medical appliance, only needs to be 12v 50Ah, looked at LifeP04 but they're still around $450.00, so me thinks, why not get one of these cheap 100Ah ones.

OR ARE THEY A COMPLETE WASTE OF MONEY??????