On high power, the FT-60 can draw 1.5 amps at 5-watts out. The problem with these AA holders is that they use spring contacts and steel wires, resulting in more resistance (and therefore more voltage drop) than you would see in the normal welded-termninal battery packs. I measured the voltage drop in a typical AA holder at 0.1 volts per interconnect pair at 1.6 amps (see www.ad5x.com
). So this says you could have maybe another 0.5-0.6 volts drop due to the battery holder. And then couple this with the lower cell voltage of NiMH or NiCad cells.
Phil - AD5X