It looks like you're new here. If you want to get involved, click one of these buttons!
The circuit runs on 2 AA cells, and has an external battery box with integrated power switch. Under high-brightness mode: A new set of alkaline AA cells would be expected to last about 60-80 hours continuously, or 10-13 days if run 6 hours per day. Under low-power mode– the default at turn on– a new set of alkaline AA cells would be expected to last somewhere in the neighborhood of 400-700 hours, or 16-30 days if run continuously.