The battery level indicator is a major annoyance and design flaw in the Roku firmware for two reasons.
1) It malfunctions constantly and pops up before your batteries are even close to being dead.
2) There is NO option in the settings to allow us to disable the battery popup notification.
As you said, there are topics on here complaining about this for several years, I actually started one of them back in July of 2020 because this annoyance had frustrated me so completely back then. This issue has still not been solved after all of this time and it definitely seems to be a non priority for Roku to address.
It's obvious that Roku is completely aware of this issue but they don't seem to care about addressing it with any solutions. I have suggested multiple times that the programming engineers simply create a software update that gives us the ability in the remote settings to turn off this pop up alert, but nothing ever comes of if.
More people need to complain about this issue. Roku created this pop up, they inserted it into the firmware and they most certainly need to be held responsible for the annoyance it's created. Giving us the option to disable this notification should be a top priority for Roku. I don't know why they won't address this but it's beyond infuriating at this point having had to live with this for so many years.
Even if the low battery notification pop up actually functioned properly it still doesn't mean that everyone wants their screen spammed with this low battery warning every time they press a button. Especially when the remote is still working just fine for several weeks after the popup starts!
Roku, FIX THIS! You've had enough time!
