In addition, there's no need or added benefit to "power cycling" lithium ion batteries, regardless of what anyone here on the internet tries to tell you.
yeah, lithium ion batteries have a lifetime set by a number charge cycles and a cycle is a full 100% of use...regardless of how that's used.
So if you charge to 100%, use to 50%, charge to 100% and use to 50% that's one cycle.
By that logic, it doesn't matter if you use 1%, charge for 1%, 100 times. that's still only one cycle.
My guess, someone in marketing that wrote the manual for the Transformer and wasn't a battery tech and that's why it tells you to charge for 8 hrs. Either that for there is something in the Transformer that resets the battery stats after an 8hrs solid charge.
who knows.