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`battery_log: true` in the gadget platform's `extra` keeps each device's battery readings in a CSV under the plugin's data directory (plugin-data/gadget/battery/<device>.csv): time, unix seconds, battery millivolts, percent, charging, external power and battery present. A row every 30 s, and at once when charging or USB power changes; rows only when a reading has a voltage or percent. Device ids are sanitized for file names, and a file rolls over to <device>.1.csv at 8 MB. Off by default. It exists to calibrate a board's battery percentage from a full discharge. Tests: test_plugin_units.py (rows and rollover), test_adapter_hermes.py (only when enabled, only state readings).
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What and why
battery_log: truein the gadget platform'sextrakeeps each device's battery readings in a CSV under the plugin's data directory (plugin-data/gadget/battery/<device>.csv): time, unix seconds, millivolts, percent, charging, external power and battery present. A row every 30 s and at once when charging or USB power changes, only for readings with a voltage or percent. Device ids are sanitized for file names, and a file rolls over to<device>.1.csvat 8 MB. Off by default.It exists to calibrate a board's battery percentage from a full discharge, which is how the AMOLED-1.75C's curves were measured.
Part of a series for the AMOLED-1.75C; the physical report is #103.
How you know it works
Tests on this branch (based on
8069101):hermes-gadget build-sim --test: core 121/121.tests/test_plugin_units.py(rows, rollover) andtests/test_adapter_hermes.py(only when enabled, only state readings), the latter run against Hermes v0.21.6.pytestwithout the simulator-window tests (no virtual display here): 271 passed, 31 skipped.In use: enabled on a Hermes gateway logging the 1.75C since 2026-10-08 20:02, about 1,500 rows so far across a full discharge and several charges.
Documentation and sources
docs/hermes-integration.md(config example and a paragraph) and a changelog line under### Hermes plugin.Checklist