Originally Posted by
msb0b
ThinkPads' power manager allows the user to set charging threshold so the user can achieve the same benefit as removing the battery pack.
That's the best way to do this. When using the system for long periods of time (weeks) w/o using the battery, set the threshold to 50% or so. You get the benefit of a UPS w/o hurting overall battery lifespan. Just don't forget to fully charge it before you travel.