I won't "load" the battery pack, it will send as much kW as it can to the heating system, and I'll live with it (by the way, today at -10C in pure EV mode, it was toasty warm with the HVAC set at 18C, AND I had "legal" EV mode... so I guess it won't be that bad at -15C or even -20C for my needs).And they blow the engines up all the time.
Unless, of course, by feeding it false temperature data, you're causing it to put load on the battery pack in a way it isn't designed to do... like not properly conditioned because it thinks it is warmer.
I'm all for modifying cars and getting them to behave how you want, but I wouldn't blindly do it without first understanding how and why the vehicle operates the way it does first.
Some tuners blow their cars trying silly things or pushing the hardware too far. But some tuners gain considerable knowledge about how their car work, and what they can do. They even treat their cars better than the vast majority of non-car enthusiasts. Let's see how I'll fare with this 😉