Some results.

The LED started flashing at 13:01 local time indicating a full battery, at which time I disconnected the charger. It is 15:40 as of this writing, and the display says 80%. Usage has been approximately:
- 1 hour FB chat while listening to audio from Yle Areena (Android app)
- 1 hour FB chat only
- 40 min idle with incoming messages bleeping and quick battery checks ~3..5 minutes apart
- screen at minimum brightness
- WLAN, 3G, BT on, GPS off
- BT tethering enabled but not active
- ssh connection over WLAN open but idle
- EDIT: email check every 15 minutes