I'm working on a design that requires I heat a bank of 18650 batteries during their operation. The plan is to mount the batteries along with large axial 2W resistors in to a PCB and using small thermostat ICs to keep them at a set temperature. (Very similar to this cubesat battery for reference).
My question is what is the best resistor composition for this purpose and whether it even really matters much? I imagine this sort of boils down to what is the most inefficient power resistor since I want the temperature to rise as much as possible. My initial thought goes to ceramic as the entire element is heating and I see that most dedicated heating elements are made of ceramic.
Any help would be appreciated, thanks!