I was just looking through my database where I log a few device health statistics for all our devices and noticed one of my three prototype Boron devices climbed up to ~ 4.5v over the weekend.
The devices use 18650 batteries (which I’m guessing are about to vent…if they haven’t already) and charge via a small solar panel. They are in a system.sleep() state most of the time, setChargeVoltage is at 4208 (mV) and setInputVoltageLimit is 4840 (which I hope isn’t where it will go to before stopping the charge).
Device is in manual mode, runs very efficiently to get weeks of charge when out of the sun, and the other two devices are doing ok.
Any ideas? Maybe a PMIC controller burned up? Anything I might have done in software?