Thanks for the reply. I have the situation taken care of. The battery inside the DP/2 is a Panasonic BR2032-1HE. This battery is a 20mm coin type "with legs". In other words it has a clip permanently attached to it. This clip is then soldered onto the DP/2 circuit board. This battery is available at: www.digikey.com.
I did not go this route. I went to: http://www.hometown.aol.com/mishon66/
They have the Panasonic BR2032 with no clip permanently attached. With this they include a separate clip. It is much easier to solder the clip (with no battery) onto the circuit board and then slide the new battery in. Also, the next time it goes bad, I just slide a new battery in, no soldering. The unit is up and working.