Yet another question. About how long should the buttons remain effective? I use one in my pouch, but they seem to work less and less after only a couple weeks. My pouch is a good one, but it is zippered, the coins take good care of my tobacco so long as they work. I wonder if this could be the result of tobacco specs getting lodged in the holes. Also, recharging them seems to be pointless. Maybe I should just buy them several at a time, they're certainly cheap enough.