diff --git a/src/hal/heltecv2.h b/src/hal/heltecv2.h
index cc7de4d1..adb74981 100644
--- a/src/hal/heltecv2.h
+++ b/src/hal/heltecv2.h
@@ -20,9 +20,13 @@
 #define HAS_LED LED_BUILTIN                           // white LED on board
 #define HAS_BUTTON KEY_BUILTIN                        // button "PROG" on board
 
-#define BAT_MEASURE_ADC ADC2_GPIO13_CHANNEL  // battery probe GPIO pin
-#define BAT_MEASURE_ADC_UNIT 2 // ADC 2
-#define BAT_VOLTAGE_DIVIDER 2 // voltage divider 220k/100k on board
+// caveat: activating ADC2 conflicts with Wifi in current arduino-esp32
+// see https://github.com/espressif/arduino-esp32/issues/3222
+// thus we must waiver of battery monitoring 
+//#define BAT_MEASURE_ADC ADC2_GPIO13_CHANNEL  // battery probe GPIO pin
+//#define BAT_MEASURE_ADC_UNIT 2 // ADC 2
+//#define BAT_VOLTAGE_DIVIDER 2 // voltage divider 220k/100k on board
+
 #define EXT_POWER_SW Vext // switches battery power, Vext control 0 = on / 1 = off
 #define EXT_POWER_ON    0
 //#define EXT_POWER_OFF   1