My battery solution for my F5: 1. Lithiums for mobile work 2. MC-32 12V adapter and 220V/12V power suppy for studio work 3. MC-32 12V adapter and a YUASA 12V lead gel accumulator for sports semistationary work. The MC-32 cable is 2,5m long and doesn´t bother me at all. My small accu weights 1200 gr and fits into my (nikon) photo vest and I can also put it on the floor or into a selfbuit cradle on my tripod. This setup is - admittedly - heavy but it saves a lot of money for the lithium batts. When I shot a rhythmic gymnastic competition here it gave me 40 rolls of 36 slide film with a lot of energy to spare (almost continuous AF and metering). Alex