There should be a lock collar where the two parts meet (splines might be showing). You just unlock it (with gloves, as the lock collar is fairly thin...
Did you register the battery with the DME? Is the new battery still draining? Did you probe all the fuses in the glove box to make sure they are all...
I've had a pretty good experience with the Depo smileys, they're like $200 and readily available from eBay. The glass is a little more fragile, so I...