EFK-II Supply LED Wireless Dental Curing Light Battery for Cordless Lamp, Curing Light Battery D1 D2 T1 (1) Medical equipment lithium batteries for D1 D2 T1 Curing Lights. Specification: 3.7V Battery 2200mAh Dimension: 18.8mm x18.8mmx 69.5mm Delivery within the US will take 2-6 working days.