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
Flying Power NS12-28L 12V 28Ah Battery with M5 - Insert Terminals
Energizer 6V 28A, 28L Alkaline Battery - 1 Pack - EVRA544BP at Batteries Plus