When I use the sketch battery.ino (VM290 example) to measure the battery voltage I get a value that is twice as high (8.3 Volts) as the actual battery voltage (4.19 V). Activating ADC ctrl makes no change.
I measure 1.8 volts on pin VBAT_READ. This is also not consistent with the voltage divider.
Does anyone (from Heltec) have an explanation?