DIR="/sys/class/power_supply"
if [[ "$BLOCK_INSTANCE" == "" ]]; then
    for BAT in $DIR/BAT*/; do
        [[ -f "${BAT}uevent" ]] && BATS+="${BAT}uevent "
    done
else
    [[ -f "$DIR/BAT$BLOCK_INSTANCE/uevent" ]] && BATS="$DIR/BAT$BLOCK_INSTANCE/uevent"
fi
[[ "$BATS" == "" ]] && printf "no battery\nn/a\n" && exit 33

ENERGY_FULL=1
ENERGY_NOW=0
STATUS=""
while read -r LINE; do
    [[ $LINE =~ POWER_SUPPLY_STATUS=Charging ]] && STATUS="⚡"
    [[ $LINE =~ POWER_SUPPLY_ENERGY_FULL=([0-9]+) ]] && ENERGY_FULL=$(($ENERGY_FULL + ${BASH_REMATCH[1]}))
    [[ $LINE =~ POWER_SUPPLY_ENERGY_NOW=([0-9]+) ]] && ENERGY_NOW=$(($ENERGY_NOW + ${BASH_REMATCH[1]}))
done <<< $(cat $BATS)

LOAD=$((${ENERGY_NOW} * 100 / ${ENERGY_FULL}))
REVERSE_COLOR=true
LONG_TEXT="$STATUS$LOAD%"
SHORT_TEXT="$STATUS$LOAD"