#!/usr/bin/env python3

with open('/sys/class/power_supply/BAT0/charge_full_design', 'r') as f:
    max_cap_design = int(f.read())
with open('/sys/class/power_supply/BAT0/charge_full', 'r') as f:
    max_cap_current = int(f.read())

max_cap_difference = int(max_cap_design) - int(max_cap_current)

pcnt_degraded = (int(max_cap_difference) / int(max_cap_current)) * 100

print(f"Battery {pcnt_degraded:.2f}% degraded")