diff --git a/variants/ttgo-t-oi-plus/pins_arduino.h b/variants/ttgo-t-oi-plus/pins_arduino.h
index 689f16c9a4f..16cac90bdaf 100644
--- a/variants/ttgo-t-oi-plus/pins_arduino.h
+++ b/variants/ttgo-t-oi-plus/pins_arduino.h
@@ -11,6 +11,8 @@
 #define digitalPinToInterrupt(p)    (((p)<NUM_DIGITAL_PINS)?(p):-1)
 #define digitalPinHasPWM(p)         (p < EXTERNAL_NUM_INTERRUPTS)
 
+static const uint8_t LED_BUILTIN = 3;
+
 static const uint8_t TX = 21;
 static const uint8_t RX = 20;
 
@@ -26,4 +28,6 @@ static const uint8_t A1 = 2;
 static const uint8_t A2 = 4;
 static const uint8_t A3 = 5;
 
+static const uint8_t BAT_ADC_PIN = 2;
+
 #endif /* Pins_Arduino_h */