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Just found your post and I've just encountered the same problem with my DEC2750 (see https://forum.opnsense.org/index.php?topic=52666.msg272506;topicseen#msg272506)

How did you manage to get yours soldered back on? Where the pads on the board still usable?

I purchased a DEC2750 back in March 2022. I recently noticed that the bios was getting reset when the unit lost power, which 99% of the time means that the onboard button battery has died.

Since the warranty had expired I decided to simply replace the battery myself. When I unmounted the unit from my rack I noticed that something was rattling around inside the case. When I opened it I could see that the button battery has apparently exploded and ripped the battery holder of the board itself (see pictures below).

Obviously this is not ideal. I've cleaned the board and case of any leftovers from the battery, but I'd obviously like to avoid having to redo all my bios configurations every time I have to turn of power for the unit.

I am alright with a soldering iron, so is it possible to fix the board? Perhaps with a new wired battery holder if the original pads are unusable?