I ordered one of those too, just to try. The higher power consumption makes me a bit wary, looks like even without the heater running it could drain my lithium battery from full to empty in around 20 days, or probably realistically drain it in 1.5-2 weeks. I doubt the car will ever sit that long but I may not find it feasible to have the battery self-warm. Guess we'll see. Really it just needs to get me through the weekend and be able to charge back up during my ~20 minute each way commute.
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