Android, Windows, & Linux applications now available through various sources. See Ardrone-Flyers.com forum.
3.6V = nominal rating of Li-Ion cell and would agree with 25W/6930 mAH battery notation. Actual cell voltage can vary from 4.2 V to 2.6V, though cut off may be around 3 V. Agree 3.8 V stamp doesn't fit.
Quote from mysterio:
One in the headphone jack and one near the dock connector, from what I'm told.
Quote from James Young:
Sure enough! Weird that Apple chose such a sound to coincide with waking/sleeping
No moving parts, but what makes the clicking noise when you wake the ipad up or put it to sleep. Sounds like heads being parked, but that can't be the case with solid state drives.