I have noticed recently that my Remote Control has started flashing all four Mode LEDs in sequence when I press the green power button, This seems to be indicating that the Batteries are low, As it stopped when I replaced them, any excuse for a WiKi animation HERE
As a designer it has bothered me for a long time that the only way to alert a user to failing batteries is usually to flash a LED and thereby hasten the demise. One would think the fact that the thing stops working should be enough. It should only be necessary to specifically warn if the calibration of the equipment in question will be compromised - in which case my preference is to shut it down and only give the low-bat warning.
That could only happen if the handset sets a bit in the data to tell the other end the battery is low. I think I mentioned elsewhere that I was surprised the handset sends out a code when you press a mode button, so anything's possible!
It doesn't transmit IR for each LED flash, so the theory in #9 isn't correct, but I think the single pulse of IR you get when first pressing the power button is longer with the low batteries than it is with new ones, so it's just possible it is sending something as well as the 'power' code. Although it could just be that the lower voltage is messing up pulse length EDIT
Iv'e just realised that as the 'Mode LED' thing only happens on a power button press the Humax (or TV) is being turned off, so it wouldn't be able to display a low battery icon anyway - Ah Well ! !
Slightly off topic but I just thought I would mention a funny I had with my handset this evening in case it chimes with anyone else: went to turn on the TV and the HDR and nothing happened despite repeated attempts and seveal pressings of various mode buttons, and the mode buttons lighting up as expected (no low-batt signal either).
I pointed the remote at my phone camera to see if anything was coming out, and it was - and the TV turned on at the same time. Everything has been fine since.