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#!/usr/bin/env bash
 
 
VOLTAGE_FILE=${1:-"/sys/class/power_supply/hidpp_battery_1/voltage_now"}    
 
 
declare -A LEVELS 
 
LEVELS["4186"]="100"                    
# 4156  99%
# ... more shit                             
LEVELS["35"]="0"    
 
VOLTAGE=`cat $VOLTAGE_FILE`
VOLTAGE=${VOLTAGE::-3}
 
for i in "${!LEVELS[@]}"
do
    if [ "$VOLTAGE" -ge "$i" ]; then
        echo "$LEVELS[$i]"
        break
    fi
done