Maratec AAA, from their web site...
Medium mode, 40 lumens output for upto 7 hours
Low mode, 1.5 lumens output for upto 55 hours
High mode, 138 lumens output for upto 70 minutes
( Rev 1 model was 80 Lumens and 48 minutes) ( Rev 2 model was 115 Lumens and 60 minutes)