Get Battery Power Consumption on Linux

wattage.py

#!/usr/bin/python

with open('/sys/class/power_supply/BAT0/status') as f:
	if 'Charging' in f.read():
		print('The battery is currently charging')
		exit(0)

scale = 1000000000000.000
voltage = 0
current = 0

with open('/sys/class/power_supply/BAT0/voltage_now') as f:
	voltage = int(f.read())

with open('/sys/class/power_supply/BAT0/current_now') as f:
	current = int(f.read())

if current < 1 or voltage < 1:
	print('Failed to read necessary battery information')

wattage = voltage * current / scale
print('Power Draw: ' + str(wattage) + ' Watts')