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Use:
$ sudo module-assistant a-i tp-smapi
and set in /etc/sysfs.conf:
devices/platform/smapi/BAT0/start_charge_thresh = 40
devices/platform/smapi/BAT0/stop_charge_thresh = 85
The tp_smapi kernel module exposes some features of the ThinkPad hardware/firmware via a sysfs interface. Currently, the main implemented functionality is control of battery charging and extended battery status.
worked for me. use at your own risk.