Stop battery charging with plugged MacBook Pro

Hi,
is it possible to stop battery charging on a MacBook (Pro) with the power plug connected? I have looked into the PM api docs but cannot find anything to do that.
The idea is to make a menu app to toggle between "Preserve Battery Life" and "Full Power" modes. According to http://www.batteryuniversity.com/parttwo-34.htm, Li-Ion batteries loose less capacity over time when charge level is about 40% of max. capacity, escpecially with the comparatively higher temperatures that are given in a running notebook.
So the "Preserve Battery Life" mode would charge to say 50%, then let the MB run on battery to about 30%, then charge again etc. Before taking it on the road, one would switch to "Full Power" mode to charge the battery to 100%.
Thanks,
Bastian

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Stop battery charging with plugged MacBook Pro

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