Thanks so much Claire for sending this in!
From Pi Borg:
Powering the Raspberry Pi from batteries for 14 hours and 30 minutes!
This time lapse video was taken with a Contour+2 on one shot per 30 seconds picture mode, which gave approximately 1750 images.
The battery pack consists of 8x GP2700 rechargeable AA batteries. It’s powering a Raspberry Pi model B+
In this test it lasted approximately 14 hrs 30 minutes. The screensaver runs at approx 22FPS and has an approximate load of 15% on the Raspberry Pi.