Charging LED

A few days ago I accidently left my HereLink ground unit on until the battery ran down.

It appears to take a charge again OK - but the LED over the throttle stick doesn’t illuminate during re-charge. I seem to recall that it used to.

I don’t recall every seeing the LED over the right stick ever illuminate.

I can’t find anything in the wiki about these LEDs.

Does the fact that the LED doesn’t come on during charging indicate a problem?