My MX, just like all of my other Pentaxen, has a 2L76 battery in it. Looks like a pair of the button cells stacked on top of each other. $3.49 at the local supermarket in the display of little batteries.
-Mat > They are about the most common you can get. It takes two 1,5 volt > batteries. > Type S76 (silver oxide), but one CR-1/3N (3 volts) also does the job. > Every > drugstore or fotoshop should have lots of them. So it's a little strange > that you must wait weeks! 5 minutes tops should be enough! > regards, Hans B.