There are several not so right statement in this. So for reference this:
http://www.batteryuniversity.com/parttwo-34.htm
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Originally Posted by orcinus
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.
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Wrong, it will be healthier afer b).
While 2-times 30% may equal to 1-time 60%, 100% is sure an additional stress factor.
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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.
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This is wrong, its is adviced to be held at 40% chargelevel if stored for a
prolonged time.
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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.
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Wrong, a lot of conditions affect the longlivity of the battery. As you can see some factors are temperature, discharge rates, discharge level, charge rate and charge level. They just don't have a "memory effect", like the Ni-Ca batteries.
Quote:
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. 
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Well it has been suggesting leaving the device on during the day, while you are not using it, to save boot time. Yes you save boot time, but you will lose lifetime of the battery. Its your device, its your decision, just be careful what you advice others to do with their devices.
Now independand if 2 50% charges are exactly the same as 1 100% charge or not. Using up your battery for nothing but saving 40 seconds of booting might not be a good idea, if you don't want to send in your iLiad after 2 years of use, or have to open it yourself to exchange the battery.