diff --git a/battery-monitor.sh b/battery-monitor.sh
index e3d345f..d40faef 100755
--- a/battery-monitor.sh
+++ b/battery-monitor.sh
@@ -35,16 +35,17 @@ group="scm"
 
 battery="BAT0"
 
-# If the battery is fully charged, exit the program.
-
-if (( minutes == 0 )); then
-    exit 0
-fi
-
 # Calculate the number of minutes that the battery has left.
 
 charge=$(cat /sys/class/power_supply/$battery/charge_now)
 discharge=$(cat /sys/class/power_supply/$battery/current_now)
+
+# If the computer is plugged in, exit the program.
+
+if (( discharge == 0 )); then
+    exit 0
+fi
+
 hours=$(echo "scale=2; $charge / $discharge" | bc -l)
 minutes=$(echo "scale=2; $hours * 60" | bc -l)