Show HN: A (marginally) useful x86-64 ELF executable in 301 bytes

A battery status program for x86-64 Linux laptops in the form of a 298-byte ELF executable.

$ btry
30.6 Wh / 31.1 Wh (98%)

Sometimes there are no energy_now and energy_full files, but charge_* files instead (at least on my ThinkPad X220). If this is the case, btry prints ampere hours instead of watt hours.

$ btry
2.2 Ah / 2.8 Ah (78%)

base64 -d <<< 'AAAAgAD//////////wA/kdbV/T4SKqi4gu7TNukZJeNdhjgGWjLCw6YYwm3tgKjiZLitH
TPynRup8/TcSWlb7S75z0Swm5ipLfTcVY6E8/U348s4Og9wn9AgwNCgnr0A0kXHg5O3HvOy7A/FMZVjVqjQy
trAuDJun4UWBOpPsREPuvRIkQw3x2/i9swEaWPcjw1UpaonANEY/kXoLt4PoHvTlNulQGdNRNiv8ceHxpgOo
FPX7wLmbeMEUlwLal8kpRg74q84kP7Uic+iE8z7kFHjzyK0W1LsQLUosF8B8F+55Iw5QWtgbJ9HzPm2cUofz
tBnp3vx7ERXQ+mz1jF6sqi63Op7TLjN9PbTebxoRYOfTfp88AA=' | xz -d > btry && chmod +x btry

• Anything that's not x86-64 and Linux is definitely not supported.
• I don't know how standard/portable the /sys/class/power_supply/BAT0 path used actually is.
• If neither an energy_full nor a charge_full file exists in /sys/class/power_supply/BAT0, an infinite loop results.
• Extra batteries (like in the ThinkPad T480) are ignored.

When my ThinkPad X220 is plugged in at the time I wake it from suspend mode, I get the charge_now file. When it is not plugged in I get the energy_now file. At least I think that's how it works.