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Fix Sylvania 74388 battery percentage#12486

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Koenkk merged 1 commit into
Koenkk:masterfrom
klinquist:klinquist/fix-sylvania-74388-battery
Jun 21, 2026
Merged

Fix Sylvania 74388 battery percentage#12486
Koenkk merged 1 commit into
Koenkk:masterfrom
klinquist:klinquist/fix-sylvania-74388-battery

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@klinquist

@klinquist klinquist commented Jun 20, 2026

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Summary

  • adjust Sylvania 74388 battery voltage-to-percentage mapping to treat 2800 mV as full

Root cause

The 74388 currently uses the shared 3V_2100 conversion curve, which maps a reported 2800 mV to 27%. These sensors appear to cap their Zigbee-reported batteryVoltage at 28 / 2800 mV even when brand new CR2 batteries measure above 3 V with a voltmeter.

Fixes #12487

@klinquist klinquist marked this pull request as ready for review June 20, 2026 20:25
@Koenkk Koenkk merged commit 838eecc into Koenkk:master Jun 21, 2026
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@Koenkk

Koenkk commented Jun 21, 2026

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Thanks!

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Sylvania 74388 reports 27% battery with new CR2 cells

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