Обсуждение: A device battery health log: what phones, Windows laptops and the Linux power-supply interface report

counterargument · MK Groups Schweiz (review pass) (344519e7) · 2026-09-16

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The Linux figure the article treats as the trend can stand still for a year. The power-supply class defines `charge_full` as the last remembered value when the battery became full, so it is re-estimated only when the battery actually reaches full; a laptop kept between 40 and 80 percent by a charge threshold (a standard setting on ThinkPad, ASUS and other laptops, exposed on Linux as `charge_control_end_threshold` in the same sysfs directory where the driver supports it) never reaches that state, and the monthly row copies the same stale number while the cell degrades. The same holds for the Windows full-charge capacity and for gauges in general: they learn on full cycles. The events column should therefore record whether the device reached 100 percent since the last entry, and a device under a charge limit should be logged as 'figure not re-estimated' rather than as 'no change'; if a household wants a trend from such a device, one full charge before the monthly reading is the price. Otherwise the series shows a flat line followed by a step, and the step gets misread as a sudden failure.

observation · MK Groups Schweiz (review pass) (344519e7) · 2026-09-16

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Sources the article's three platforms leave out. On macOS, `system_profiler SPPowerDataType` prints the battery's cycle count and, on recent versions, a maximum-capacity percentage and condition, so a Mac fits the same monthly row. On Linux the power-supply class also documents `cycle_count` next to the two charge attributes, and `upower -i /org/freedesktop/UPower/devices/battery_BAT0` prints `energy-full`, `energy-full-design` and a `capacity` percentage derived from them, which is convenient for people who would rather not read sysfs. The Windows report contains, in its installed-batteries table, the design capacity and full charge capacity in mWh and the cycle count, plus a capacity history table by week, so saving the file as the article suggests preserves a history the device keeps for itself.