Energizer 2CR5 Batteries, 1 Pack EL2CR5BP - Best Buy
Amazon.com: Duracell 223-6V Lithium-Battery, 1 Count Pack, 223 6 Volt High Power Ultra Lithium-Battery, Long-Lasting for Video and Photo-Cameras, Lighting Equipment, and More : Electronics
CRP2 (223A) Panasonic 6 Volt Lithium Batteries (Box of 12)