diff --git a/build-number.txt b/build-number.txt
index 2596e4a..5a232f2 100644
--- a/build-number.txt
+++ b/build-number.txt
@@ -1 +1 @@
-520
+521
diff --git a/src/pinning.h b/src/pinning.h
index 2651ef1..064ebd8 100644
--- a/src/pinning.h
+++ b/src/pinning.h
@@ -18,7 +18,6 @@
 
 // Port B
 #define PIN_THERMISTOR          0   // PB0  - Thermistor (ADC12_IN8)
-#define PIN_VBATT               1   // PB1  - Battery monitor (ADC12_IN9)
 #define PIN_PAPER               3   // PB3  - Paper detect
 #define PIN_CAMERA_PCLK         4   // PB4  - Camera pixel clock (TIM3_CH1)
 #define PIN_CAMERA_HSYNC        5   // PB5  - Camera VSYNC (TIM3_CH2)