I have a DIY 8V pack, made from a more or less ordinary 6v gel cell battery, about 5Ah, and a more unusual Hawker Cyclone 2V gel cell 5Ah strung together to deliver 8V. I use it with a sunpack hammerhead or my metz 45 unit. It hangs from my belt. My Quantujm was gifted to me after I made the DIY pack. Prior to getting the Quantum and its charger, I charged the thing off a mid 60's Braun Hobby EF300, which also ran off of an integral 8V pack.