@Riva. Riva, thank you for telling me about that! I was wondering what the emissivity packet was but I never did find out. The difference between the TN9 and the DS1307 is that the DS1307 is inside an enclosure, which gets up to the 55C I was talking about, but the TN9 is left in a separate more ventilated enclosure. According to the TN9's onboard ambient temperature sensor, the TN9 enclosure never goes above ~37C. See 
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