Yes, for professional flash units like Norman (particularly for the older battery systems), battery powered movie cameras like Beaulieu (I've got one, and you can find them all the time on eBay), and for sealed Ni-Cd packs for motor drives, like some of the ones made by Canon (eventually, I just sold mine so someone else could rebuild it and bought one that takes regular AAs). I think the Hasselblad EL/M also has a sealed battery pack for which one sometimes sees rebuilds.