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the battery clip itself is fine

The holder did come off the board in two cases after putting the battery in.
So basically the pressure (on the solder points) was so high, that it came off.
I learned from that and resolderd the other 2 Pucks before putting in the battery.
So it definitly IS a problem with the holder or the "new" kind of batteries (used VARTA CR2032 2pc Lithium Blister / EAN: 4008496746460).

The video is misleading in the way, that there is a contact problem, but he mentions, that his batteries are thicker too.
I do NOT have a caliper to measure the batteries and inside e.g. an Apple Airtag they seem to be perfect (also due to the different holding mechanism).

Since the name is "2032" one can think that it is 20 mm x 3.2 mm but as always some people like to break the rules ;)

I purchased a few puck.js (all of them are hardware version 2.1a) and all of them seem to have a problem with the "newer" CR2032 battery, that are a little bit thicker, due to the surface on the back.
I had to resolder the battery holder, and put a little bit more solder on the surface but obviously that is not the best solution (and I am not nearly as good in soldering as the machines in the factory are).

I definitly affects other products as well (see https://www.youtube.com/watch?v=zz1POx0fw2w
), and I ask myself, if there is a better way to make the battery holder more robust. Maybe it is possible to change the holder with a other version like https://cdn-reichelt.de/bilder/web/artikel_ws/D600/BH1060.jpg ?

Hope to hear from you guys, if you have similiar problems.

BTW: Thank you @Gordon for all the great work you are doing. If you will ever be in Berlin/Germany, you will be my guest in every possible way :P

All the best,
David

https://github.com/seemoo-lab/openhaystack/blob/ffc5170ea4b4ceb1ad84e4f89324d6e666ffc7c3/Firmware/ESP32/main/openhaystack_main.c#L27

Hope someone skilled can translate this into JS code, withouth any changes to the Puck.JS firmware.