Most of us have a battery guage on our transmitters, but I have not seen one on the receiver. I know they exist, and I have a simple one on my electric shaver (6 LEDs) which would do fine if I decided not to shave again (!).
Does anyone have any experience or sources? I think it would need to give a quick indication when you turn on the boat before launch, but not consume sgnificant power...
Gerry