--- /src/plugins/batt/batt_sys.c.orig
+++ /src/plugins/batt/batt_sys.c
@@ -220,7 +220,7 @@
     if (b->last_capacity < MIN_CAPACITY)
 	b->percentage = 0;
     else
-	b->percentage = ((float) b->remaining_energy * 100.0) / (float) b->last_capacity_unit;
+	b->percentage = ((float) b->remaining_capacity * 100.0) / (float) b->last_capacity;
 	    
     if (b->percentage > 100)
 	b->percentage = 100;