I dont think the resistors are faulty but the design. Resistors (especially low-ish value 22Ohm ones) are meant to dissipate energy as heat. Putting them in a cramped housing made of plastic, then using them to dissipate high power is going to build up heat in there.
There could also be another component faulty that puts too much current into the resistors. They are probably part of the balancing circuit.
Inject liberally into veins switches, connectors, and other electronic moving parts that I’d like to be waterproof.
(0. Cover PCB in nail polish or specially-made products)
I dont think the resistors are faulty but the design. Resistors (especially low-ish value 22Ohm ones) are meant to dissipate energy as heat. Putting them in a cramped housing made of plastic, then using them to dissipate high power is going to build up heat in there. There could also be another component faulty that puts too much current into the resistors. They are probably part of the balancing circuit.