Oh, yeah, one more thing. A trick question.
What do you think: will a Li-Ion battery be healthier after:
a) 500 100% discharge-charge cycles,
b) 1000 50% discharge-charge cycles, or
c) either?
The answer is, for all intents and purposes - c.
Why? Because, while it's true Li-Ion batteries don't "like" being kept discharged below 50%, that statement is valid for
prolonged periods of time, not casual use. They shouldn't be kept
stored in semi-discharged or discharged state, not discharged below 50% during normal operation.
To sum things up, it doesn't matter which way you go - the total amount of charge (electrons, ampere-hours, coulombs) received and discharged during a lifetime is what makes a battery age, not the depth of the cycle. At least that's the way things work with modern batteries and modern charging electronics.
PS: Just by the way, i still don't understand what all this has to do with the discussion at hand, because no one ever suggested discharging the battery all the way or keeping the iLiad on continuously, for a full battery discharge cycle. 