hardware: Bluetooth module voltage conversion.

hackamp/hardware/fp-info-cache

-18265945952516957
+18265948801828957
 Battery
 BatteryHolder_Bulgin_BX0036_1xC
 Bulgin Battery Holder, BX0036, Battery Type C (https://www.bulgin.com/products/pub/media/bulgin/data/Battery_holders.pdf)

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