Mobile Device Batteries as Thermometers
summary
Claim: mobile batteries reliably indicate ambient temperature. Implementation: BaT runs on Android, continuously reads battery voltage, current, and battery-reported temperature, classifies thermal state, then applies SVM for stable state or search-based for transient estimation. Evaluation: deployed on 6 Android phones, 19 lab experiments and 36 field tests, compared to 13 Play Store thermometer apps, and reports 1.25°C average error while outperforming off-the-shelf apps; models self-calibrate via coupled methods for improved accuracy.
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