BATTERY: improve battery script and configuration in .profile

.profile

@@ -14,6 +14,9 @@ for term in kitty termite qterminal urxvt rxvt-unicode sakura gnome-terminal; do
   fi
 done
 
+# Pour la batterie des ordinateurs portables (~/bin/battery)
+#export BATPATH="/sys/class/power_supply/BAT0"
+
 # Permit DBUS to be launched
 if [ "$0" = "/usr/sbin/lightdm-session" -a "$DESKTOP_SESSION" = "i3" ]; then
   export $(gnome-keyring-daemon -s)

bin/battery

@@ -46,6 +46,7 @@ battery_status()
 case $(uname -s) in
     "Linux")
         BATPATH=${BATPATH:-/sys/class/power_supply/BAT1}
+        [[ -h "${BATPATH}" ]] || return 0
         STATUS=$BATPATH/status
         [ "$1" = `cat $STATUS` ] || [ "$1" = "" ] || return 0
         if [ -f "$BATPATH/energy_full" ]; then