We stop at dealerships by chance.
We picked up the ultra from dealer, dropped it off a couple days prior to get 1K service and alarm/pager installed. Left dealer on a week long tour. on the 5th day out stopped at an outta area dealer to replace pager battery(or to see what was wrong with it) The woman at the parts desk (couldve been owners wife) looked up P/N and retrieved it from the back , She popped open the pager and had a strange look on her face, looking at the battery for a few extra seconds and shrugged and said huh. I asked what, and she said all of the pagers she has seen HD supplies the battery and it is marked HD. My battery was some off brand and it lasted all of a week.
Moral of this story ... it's the little things
The new battery was three dollars and change , but I'm somewhat miffed at the home shop.