diff --git a/firmware/drivers/power.c b/firmware/drivers/power.c
index 85f1393719..9811d85c8e 100644
--- a/firmware/drivers/power.c
+++ b/firmware/drivers/power.c
@@ -45,10 +45,10 @@ int battery_level(void)
     if(level > BATTERY_LEVEL_FULL)
         level = BATTERY_LEVEL_FULL;
 
-    if(level < BATTERY_LEVEL_DANGEROUS)
-        level = BATTERY_LEVEL_DANGEROUS;
+    if(level < BATTERY_LEVEL_EMPTY)
+        level = BATTERY_LEVEL_EMPTY;
 
-    return ((level-BATTERY_LEVEL_DANGEROUS) * 100) / BATTERY_RANGE;
+    return ((level-BATTERY_LEVEL_EMPTY) * 100) / BATTERY_RANGE;
 }
 
 void charger_enable(bool on)
diff --git a/firmware/drivers/power.h b/firmware/drivers/power.h
index 9ad657c536..497d129e8b 100644
--- a/firmware/drivers/power.h
+++ b/firmware/drivers/power.h
@@ -20,10 +20,11 @@
 #define _POWER_H_
 
 #define BATTERY_LEVEL_SHUTDOWN (4500000 / BATTERY_SCALE_FACTOR) /* 4.5V */
+#define BATTERY_LEVEL_EMPTY (4650000 / BATTERY_SCALE_FACTOR) /* 4.65V */
 #define BATTERY_LEVEL_DANGEROUS (4750000 / BATTERY_SCALE_FACTOR) /* 4.75V */
-#define BATTERY_LEVEL_FULL (5300000 / BATTERY_SCALE_FACTOR) /* 5.3V */
+#define BATTERY_LEVEL_FULL (5200000 / BATTERY_SCALE_FACTOR) /* 5.2V */
 
-#define BATTERY_RANGE (BATTERY_LEVEL_FULL - BATTERY_LEVEL_DANGEROUS)
+#define BATTERY_RANGE (BATTERY_LEVEL_FULL - BATTERY_LEVEL_EMPTY)
 
 bool charger_inserted(void);
 void charger_enable(bool on);