The responses by "customer service" personnel on this and other threads have further convinced me, beyond any doubt, that fitbit is a dishonest company that I no longer wish to do ANY business with, and will no longer support.
To the fitbit company employees posing as customers that posted the glowingly happy reviews about how customer service quickly solved their problem by sending a "new one" (you mean battery, of course, because there ARE no new fitbit Charge 2's in stock to send out), please help me out by answering the following:
1) How do you explain why your battery (that was working perfectly and holding a charge for days and days) suddenly went bad, just following the update that fitbit pushed out?
2) How does fitbit explain the fact that so many people are having the same identical issue, just following their update? Is this a massive global coincidence that so many people who have had months and years of no battery-life issues suddenly all now can't hold a charge for a full day, and the only event that all these people have in common is that the battery life issue started just after they installed the update?
3) And, if you are one of the happy "customers" who received a new battery from customer service, did they also send you the tooling and instructions needed to change it? Because, unless you are a watchmaker or do other work with extremely small screws and fittings, you would have had to spend some time finding and buying the jeweler's sized tools needed.
4) And how did you get the screen off in order to get to the panel where the screws are? Did fitbit send you the heat gun to heat up the display screen and the very thin pry tool needed to pry the screen off to gain access to the miniature screws that remove the internal panel that covers the battery? Did they give you instructions on how to depress the clip that holds in the ribbon connector and detach it without breaking it?
I for one refuse to run out like a sheep (as fitbit intends) and buy a new fitbit because the company, either deliberately and maliciously, or because of a stupid programming error they will not admit, made a perfectly good Charge 2, with years of remaining useful life, go into instant battery-drain mode.
I will be shopping for a new activity tracker this coming Monday ... But it WILL NOT be a fitbit brand.
This will be a great business school case study some day, about how a very successful company, with an iconic brand, unparalleled market-share and tremendous customer-loyalty, totally tanked themselves, either because of their short-term greed and need to move new product, or their failure to admit and correct their programming mistake.
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How long is the battery of your Charge 2 lasting lately? In the meantime, I'd like you to review the tips in this post to make the battery of your tracker last longer. If the issue persists, and the battery is draining very quickly, let me know, and I'll further assist you. 
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