It’s probably dead then. I’ve had the same issue recently and when it eventually decided to turn back on the battery would drain from full to 0% in less than two hours.
Have you tried resetting through the charging cable? There is a little button on the USB end that has to be pressed 3 times in 1-second intervals with your Fitbit on charge. Then you wait for 10 seconds. You can then try to unpair your device from your phone, turn bluetooth off, turn your phone off, re-install the app. If the Charge 5 screen wakes up you can also try to erase your user data in settings and restart your device from the screen.
None of the above worked for me, even though I tried it multiple times. Nevertheless you will need to do all these things if you contact customer support so it may be better to try everything before you call to save yourself some of the frustration. They will also try to make you believe that you are probably using too many apps in the background, leave GPS on all the time etc. But if you look around this forum, there are several threads leading to the same conclusion - Charge 5 has an issue and Fitbit are not admitting it for whatever reason, so it is hard to say how many users may be affected and if it is possible to get a properly working device or if they all fail sooner or later.
The thing some people are suggesting is that the update released in July 2022 messed up their batteries. I have just received my replacement Charge 5 and I am not going to install this to see if there’s any truth in that. Although I had the update from July and my device broke in November, so cannot really draw a direct relation.
On a more cheerful note customer service people were really friendly and helpful.
Hope this helps.
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