Update: Even better battery script.

scripts/battery

@@ -11,13 +11,14 @@ dir_icons="/usr/local/bin/icons"
 # notify when below this percentage
 warning_level=20
 
-# how often to check battery status, in minutes
-check_interval=1
+# how often to check battery status, in seconds
+check_interval=60
 
 while true; do
-  battery_level=$(upower -i $(upower -e | grep BAT) | grep -E "percentage" | sed 's/[^0-9]//g')
-  discharging=$(upower -i $(upower -e | grep BAT) | grep -E "state" | grep -c "discharging")
-  time_to_empty=$(upower -i $(upower -e | grep BAT) | grep -E "time to empty" | sed 's/[^0-9,.]//g')
+  path_to_battery=$(upower -e | grep BAT)
+  battery_level=$(upower -i "$path_to_battery"  | grep -E "percentage" | sed 's/[^0-9]//g')
+  discharging=$(upower -i "$path_to_battery"  | grep -E "state" | grep -c "discharging")
+  time_to_empty=$(upower -i "$path_to_battery"  | grep -E "time to empty" | sed 's/[^0-9,.]//g')
 
   # check if battery is low and discharging
   if [ "$battery_level" -lt "$warning_level" ] && [ "$discharging" -eq 1 ]    
@@ -29,5 +30,5 @@ while true; do
         -i $dir_icons/battery.svg
   fi
 
-  sleep ${check_interval}m
+  sleep ${check_interval}s
 done