Changes according to discussion here:

https://meshtastic.discourse.group/t/heltec-tracker-v1-and-v1-1-power-config/12016/4

WORK IN PROGRESS

TL;DR.

Output high to measure voltage in the same why as other heltec device forces the ESP32 to try to pump 3.3v into the base of Q3.
Solution, use internal pullup and pulldown resistors.
http://community.heltec.cn/t/wireless-tracker-power-consumption/13841/6

Progress so far:

* Hasn't caught fire yet.
* Battery measurements seems ok

TODO:

* Measure current, check voltages at pins.
  * Not in a position to measure or a differences for a few days.
* take a better look at code
* CLA issues? credit to OP?
* check circuit for tracker v1.0

Related to this open issue.
meshtastic#3760

src/Power.cpp

@@ -270,10 +270,15 @@ class AnalogBatteryLevel : public HasBatteryLevel
 
 #ifndef BAT_MEASURE_ADC_UNIT // ADC1
 #ifdef ADC_CTRL              // enable adc voltage divider when we need to read
+#ifdef HELTEC_TRACKER_V1_1
+	pinMode(ADC_CTRL,  ADC_CTRL_ENABLED == LOW ? INPUT_PULLDOWN : INPUT_PULLUP);
+	//suggested in discourse.
+#else	
         pinMode(ADC_CTRL, OUTPUT);
         digitalWrite(ADC_CTRL, ADC_CTRL_ENABLED);
+#endif	
         delay(10);
-#endif
+#endif // ADC_CTRL
         for (int i = 0; i < BATTERY_SENSE_SAMPLES; i++) {
             int val_ = adc1_get_raw(adc_channel);
             if (val_ >= 0) { // save only valid readings