Duracell PX 28A A544 100mAh 6V Alkaline Button Top Medical Battery - Equivalent to 4LR44, 544 (PX28AB) - 1 Piece Retail Card
Amazon.com: Duracell 28L 6V Lithium Battery, 1 Count Pack, 28L 6 Volt High Power Lithium Battery, Long-Lasting for Video and Photo Cameras, Lighting Equipment, and More : Electronics
Amazon.com: Duracell 28L 6V Lithium Battery, 1 Count Pack, 28L 6 Volt High Power Lithium Battery, Long-Lasting for Video and Photo Cameras, Lighting Equipment, and More : Electronics