Addendum 30.03.2015: I have charged the batteries after Bettbauaktion and now used again only to build a pergola, drilling screws, the batteries are still full, and I screw and drill now already all the time with a battery, the Reserve Battery I have not even needed. I think that's fine, load after use, put away, and dig out months later without thinking and losarbeiten - so that is.
I've found that you have to keep bit holder with 6-eck base very accurately and precisely when tightening, otherwise they tilt in the chuck and eggs very doll, that is a bit tricky, but everything else is perfect. Perhaps this is the reason why some have problems with the device.
Addendum to Bosch: Amazingly, she still works with a slit thing attachment for wall slots for electric cables ...