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With old technology batteries (lead acid etc) it was beneficial and in fact required if you wanted long life to ensure they were discharged fully on a regular basis. (Not everytime obviously) Even now some technologies still benefit from deep discharge, eg Nicads. However Li Ion are different and my understanding (though I haven't had to look in depth at batteries for a number of years now) is that they do not benefit from regular full discharges.
Typical quotes for Li ion technology varies a lot but seems to end up around the 500 - 1000 cycles. I don't have a feel for Li ion yet, but I would expect that to be reasonable and hence around 2 - 3 years in a "typical" use. heavy use would shorten that.
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