diff --git a/radio/src/targets/horus/adc_driver.cpp b/radio/src/targets/horus/adc_driver.cpp
index 23c0becd8c..932f752a09 100644
--- a/radio/src/targets/horus/adc_driver.cpp
+++ b/radio/src/targets/horus/adc_driver.cpp
@@ -139,7 +139,7 @@ void adcInit()
 
 uint16_t getRTCBatteryVoltage()
 {
-  return rtcBatteryVoltage * 330 / 2048;
+  return (rtcBatteryVoltage * ADC_VREF_PREC2) / 2048;
 }
 
 const uint16_t adcCommands[MOUSE1+2] =
diff --git a/radio/src/targets/taranis/hal.h b/radio/src/targets/taranis/hal.h
index f6700c17bb..872758f9a0 100644
--- a/radio/src/targets/taranis/hal.h
+++ b/radio/src/targets/taranis/hal.h
@@ -703,7 +703,7 @@
   #define ADC_EXT_SET_DMA_FLAGS()       ADC_DMA->LIFCR = (DMA_LIFCR_CTCIF0 | DMA_LIFCR_CHTIF0 | DMA_LIFCR_CTEIF0 | DMA_LIFCR_CDMEIF0 | DMA_LIFCR_CFEIF0)
   #define ADC_EXT_TRANSFER_COMPLETE()   (ADC_DMA->LISR & DMA_LISR_TCIF0)
   #define ADC_EXT_SAMPTIME              3    // sample time = 56 cycles
-  #define ADC_VREF_PREC2                330
+  #define ADC_VREF_PREC2                200
 #elif defined(PCBX9DP)
   #define HARDWARE_POT1
   #define HARDWARE_POT2