Yes. The crucial bit that I missed (or misinterpreted) was that it doesn’t “reverse the polarity”. Once you mentioned that (and I subsequently observed for myself) it became clear.
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This is how a smarter person than I intelligently describes what I was poorly attempting to say!
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I realized after @gwydion posted that this was what you were getting at. My apologies for being a bit quick on the trigger finger 
A lesson in taking a step back … 
The funny thing here is that I, not being a botanist, used the term “polarity” rather than just saying “put the battery in the other way around.” This was all rather amusing though and I’m glad to see apologies made. This really is a great community.
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Never that amusing to make an arse of oneself in public but I can smile, if a little wince, about it now 
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I have done this soooo many times I’m a bit of a legend around here.
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I have a few years on you as a computer engineer, but that doesn’t mean much. For some strange reason, surface mounted capacitors can and do accumulate a ‘static’ charge and the only way to remove it is to short out the capacitor’s charging circuitry. That’s what “grounding” out the battery terminals appears to accomplish. In any case, it’s the second thing recommended. The first is to remove the battery for about five minutes.
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You have my sympathy @titanicus, as another “professionally qualified electronic engineer” I also interpreted “putting the battery in upside down” as reversing the polarity and got quite head scratchy for a bit there (even though I defected to digital 0’s and 1’s as soon as I graduated 30+ years ago so not a lot analog in my head to get scratched). Electronic design v mechanical design, eh, proper mind fudge, glad I’m retired… and have a Garmin HR monitor 
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Yes. I develop and implement algorithms on FPGAs, really, but I thought I knew my basics.
Back to school, maybe …
For Garmin HRM is the resetting process the same https://forums.garmin.com/sports-fitness/running-multisport/f/accessories-sensors/227664/garmin-hrm-dual-not-working/1306668#1306668
So the issue got worse and worse, inverting and needing to reset mutiple times a session. Pictured is my high tech engineering solution, for which I needed all my skills as an experienced electrical engineer. And…that works. So clearly something wrong with the battery cover and/or seal. But hey, it’s only my third Tickr X this year.
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New challenge: How many TICKRs can you break in a year?
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Duck tape for the win!
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Funny you should mention the battery cover. I had this happen to my Tickr Battery cover:
Seems one of the tabs was broken completely, another was half broken and the third was fine. I reached out to Wahoo CS and they sent me a replacement (Tickr that is, not just the cover) 
Edit: I’ll have to try the duct tape solution as a back up should anything go wrong with the new one 
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I had exactly the same experience with Tickr X number 2 Battery tab broken, Wahoo sent a completely new unit as replacement. Great customer service, but an improved battery cover design would be even better…
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