Thanks, I'd appreciate that link if you find it, pizzaman. What radio do you have?

I may not have been clear, my interest in an AA pack is not as an emergency backup. It would be for primary use and I'd put NiMH rechargeable cells in it. The lithium ion pack can be nice under some circumstances but I'd rather not have to replace it ($$$) or use a special charger for it. I try to choose devices that use AA's so I can run practically everything on NiMH cells and a couple of chargers that I share between everything. So I'd use the AA pack as the main pack, and the lithium ion pack as the backup, and maybe have some lithium AA cells for emergencies but the main cells would be NiMH. For the IC-P4AT there's a 6AA pack that works pretty well, for example.