Other Parts Discussed in Thread: BQ24072, BQ24075, BQ24075T, BQ24072T, BQ24079T, BQ24079
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The BQ24073 uses a current based NTC monitoring system which makes it difficult to change to 0C to 45C, even with resistors in series or parallel to the NTC resistor. What Varta can do is switch to the BQ24072T, BQ24075T, or BQ24079T (T versions of the BQ24072, BQ24075, and BQ24079 respectively).
I've got a more detailed explanation on their differences here: [FAQ] BQ24072T: What are the differences between the BQ24072T and the BQ24072
You can then add resistors to adjust the temperature threshold based on the desired RNTC HOT and COLD values