One Double A

About a week ago I flew the Cher OH kee down to Carolina to pick up my son and his girlfriend. And to bring them back to our farm. The weather was marginal VFR so I filed both ways. As soon as I got going, I discovered my Garmen portable GPS was out of power. Batteries dead. But it was plugged into the airplane's cigar lighter. I pulled out the plug and it was broken. I didn't have any spare batteries. At the FBO in Carolina, they had no batteries. Except the guy had a single double A just lying on the desk which he gave me. After we got up and going home I was trying to find the 30 knot tailwind that wasn't there. My son asked me for the single double A and the dead GPS. He pulled out the 4 double A's and started doing wierd things like rubbing them on his jeans and in his hands. then he put in the one "new used" one with the dead ones. He kind of spun the batteries around in their sockets before he put the little cover plate back on. The GPS worked perfectly all the way home for two hours.