So I came across a Manhole G&W the other day. Unfortunately, I have no idea whether or not it is working, because it only contains one battery.

Even more unfortunately, I can't seem to find these batteries anymore. It says on the back of the G&W that it takes SR43 or LR43 batteries; the one inside is a Maxwell SR43W. Google searches don't turn up many hits.

Does anyone know what the story is here? Do these batteries still exist under another name?