If I were going to be using these with infrequent regularity, I'd use a dowel to hold lead wires in contact on the LB out to a battery pack hanging out the back that I could pop three NiMH AAAs (1.2v each) in when I was using them. There's a thread around here about using battery packs instead of 3.6v batteries, only I'd dangle them out the back for safety.