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Battery history of the sensor. Every NEW measurement of the associated sensor (live or caught up, at its measurement time, never a duplicate) is archived on the SD card in /history/battery/YYYY-MM.csv (ts,volts,pct, ~200 KB per month). Kept apart from the weather history on purpose: its binary format is read by morfAnalytics and the battery is not a weather measurement. No SD: nothing archived (one warning); "clear history" does not erase it.
GET /api/battery?days=N (7 by default, 365 max): points averaged into buckets (<= ~400 points, bucket >= 5 min), so a 90-day query stays light on the ESP32 and the browser.
System page: "Battery of the sensor" card, voltage curve over 24 h / 7 d / 30 d / 90 d (plain SVG, no library).