I deeply feared reactions of the above kind.
Of course I read about the theories and things people claimed to know by hands-on experience - but this does not match with my own practical experience with LiIon batteries.
I used two identical types of LiIon batteries with my Nokia cellphone:
One I recharged after the phone switched off itself due to low battery capacity only, another one I recharged whenever I thought about charging the thingy.
The first one is still ok, the second one is trashed.
Same results with notebook batteries (Acer Travelmate 800LCi), same results with LiIon batteries used with PDAs (Handspring Visor Edge).
Of course this might be pure coincidence, but I just don't believe in that.

Also there might be quite some differences in LiIon batteries - some that "know" how to behave properly according to public theories supporting LiIon battery manufacturers and some that don't.
But how to find out what kind of battery is used in the reader ?
So is there any chance to sync the Reader without charging ?