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I'm considering exchanging my laptop battery, but figured that it makes sense to know which capacity it had initially.
I don't have the /proc/acpi/battery/ directory and sudo acpi -i only prints the charging state. sudo lshw-gtk doesn't contain any information other then "Unknown".
I'm using Ubuntu 17.04.
/proc/acpi/battery is now /sys/class/power_supply/ (source: where did /proc/acpi/battery/BAT0/XXX go in 12.10?) which contains the capacity in Wh in [BAT identifier]/capacity.
