diff --git a/src/example_config.h b/src/example_config.h
index 6e356e0..7b76eff 100644
--- a/src/example_config.h
+++ b/src/example_config.h
@@ -13,5 +13,5 @@
 // Battery measurement
 #define R1 220000.0 // 220k ohms
 #define R2 56000.0  // 56k ohms
-#define VOLTAGE_MAX 4.2 // Full battery voltage
+#define VOLTAGE_MAX 4.0 // Full battery voltage
 #define VOLTAGE_MIN 3.0 // Empty battery voltage
\ No newline at end of file