Raspi UPS HAT auto shutdown

sudo raspi-config #Enable Interfacing Options>I2C
sudo apt-get install i2c-tools #Install i2c-tools
nano ~/ups.py  #Make a new python script and add the code below
crontab -e
/5 * * * * python /home/pi/ups.py > /dev/null 2>&1 #Add to crontab. Run script every 5 min.

import struct
import smbus
import sys
import time
import os

lowest = 60

def readVoltage(bus):
  "This function returns as float the voltage from the Raspi UPS Hat via the provided SMBus object"
  address = 0x36
  read = bus.read_word_data(address, 2)
  swapped = struct.unpack("<H", struct.pack(">H", read))[0]
  voltage = swapped * 78.125 /1000000
  return voltage

def readCapacity(bus):
  "This function returns as a float the remaining capacity of the battery connected to the Raspi UPS Hat via the provided SMBus object"
  address = 0x36
  read = bus.read_word_data(address, 4)
  swapped = struct.unpack("<H", struct.pack(">H", read))[0]
  capacity = swapped/256
  return capacity

def shutdown():
  os.system("sudo shutdown -h now")

bus = smbus.SMBus(1)  # 0 = /dev/i2c-0 (port I2C0), 1 = /dev/i2c-1 (port I2C1)
print "Voltage:%5.2fV" % readVoltage(bus)
print "Battery:%5i%%" % readCapacity(bus)

# Only check if we are low
if readCapacity(bus) < lowest:
  first = readCapacity(bus)
  time.sleep(5)
  second = readCapacity(bus)
  # If battery capacity is dropping
  if first > second:
    shutdown()