If you were to push on the + thing (negative battery terminal) could you move it around? Will it fall out if you flipped the deltapoint upside down? If it does move and can be removed from the unit, can you provide close up pictures of the ends of the +?
I'm a new owner of a deltapoint pro and haven't examined the internals yet, but in electronics manufacturing we test solder connections. I'm assuming the solder connections on the battery terminal are breaking, but not sure of how. It could be melting by heat, or fracturing through vibration (the slide moving back and forth). If fractured, it would remain loose. If by heat, it could seem to rotate or slightly move and then resolidify so it won't move when you push on it.
I have received a few questions about the DP Pro, and wanted to share some of what I have learned about how the optic works. First, the “+” that locates the battery is not soldered, it needs to float by design. What keeps it anchored is a clear decal that covers the + and keeps its feet contacting on the copper colored area.
Leupold also uses a date code as per of the serial number, with the last two letters indicating date of manufacture. I believe AF is 2018 manufacture, but need to confirm.
More later.
Likes pretty much everything in every caliber.