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@Gordon
Hi - when did you get your Puck 2.0? I know the first batch of 2.0s did have this issue and we ended up testing and reworking many of them.
... but obviously if we test and the battery holder doesn't come loose, we don't know if it'll let go 1 year later or not.
I think the Puck.js 2.1 which we've had on sale for a while (almost a year?) are fixed - the manufacturer changed the profiles on the oven which meant the solder melted better.
The change to surface mount was really because we needed to space to put the extra sensors on - but as you note the PCB itself is solid enough to handle it - in this case it was just a manufacturing fault with how the solder was applied