Keyboard battery low

I am using UM 21.10 on 2 separate HP (a Spectre and an Envy) - been on UM since 17.04. No material problems so far; all with a solution found here. Thanks for that.
Its been a while that indicator shows that Keyboard Battery is low... but no problem with the hardware itself - at least so far.
Is it the indicator that has the wrong reading ?
Is it that it can't identify a keyboard battery, hence showing as low ?
Has anyone here experienced that ?
Any way to really get into testing what's true or not ?
No impact on the day-to-day work; but would like to know.
Thanks for the super job.