bat_files="/sys/class/power_supply/BAT0"
bat_status=$(cat ${bat_files}/status)
capacity=$(cat "${bat_files}/capacity")

function set_capacity() {
    if [[ ${capacity} -lt 10 ]]; then
        cap=0
    elif [[ ${capacity} -lt 20 ]]; then
        cap=10
    elif [[ ${capacity} -lt 30 ]]; then
        cap=20
    elif [[ ${capacity} -lt 40 ]]; then
        cap=30
    elif [[ ${capacity} -lt 50 ]]; then
        cap=40
    elif [[ ${capacity} -lt 60 ]]; then
        cap=50
    elif [[ ${capacity} -lt 70 ]]; then
        cap=60
    elif [[ ${capacity} -lt 80 ]]; then
        cap=70
    elif [[ ${capacity} -lt 90 ]]; then
        cap=80
    elif [[ ${capacity} -lt 100 ]]; then
        cap=90
    else
        cap=100
    fi
}