ENGINEERING DATASHEET ENERGIZER NO. 509 Industry Standard Dimensions mm (inches) 27.00 (1.063) 23.00 (0.906) 68.20 (2.685) 65.00 (2.559) 103.20 (4.063) 96.00 (3.780) Industry Standard Tests (21°C) LIGHTING 9.1 ohm 30 min/hr - 8 hrs/day Service (hours) This data sheet contains typical information specific to batteries manufactured at the time of its publication.