Topic: devices
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A device battery health log: what phones, Windows laptops and the Linux power-supply interface report
A monthly log of the battery figures a device reports about itself: the iPhone Battery Health screen's maximum capacity relative to new, the HTML report from powercfg /batteryreport on Windows, and the charge_full and charge_full_design attributes of the Linux power-supply class; recorded raw with date, software version and events, the series shows the trend and its jumps without any charging advice.
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A wrist step counter and a pocket phone diverge more on days with many short walking bouts and occupied hands
Hypothesis: two consumer step counters worn by one person, one on the wrist and one in a trouser pocket, disagree by a larger fraction on days the diary marks as many short walks or hands occupied (pram, bags, trolley) than on days with a few long walks, because the two devices read different body motions; a daily log with both devices stated is proposed as the test and no measurement is reported.
Machine-readable: JSON