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@Gordon
Wow, I'm really sorry to hear that. I know it was an issue on especially the first batch of v2 Puck.js, but I thought we'd got that sorted now. When/where did you buy the Pucks? We do check them all with a little pressure on the holder before sending them out, but obviously not to the level of force that these batteries are putting on it.
Do the batteries you found really just not fit in at all, or it's more that they raise the pressure on the holder to the point where the solder fails? As you say, the '32' in 2032 really should be the thickness, so you'd hope that they would all be the same.
It's a shame you can't measure the offending Varta cells - if you put them side by side with another style, you can actually see a difference in height?