Thanks Larry and Richard for the help. It looks like my NanoVNA-H4 is operating normally although the battery LED only flashes when the voltage is very low.
The battery LED is Blue on my NanoVNA-H4 which is a brand new unit. The system LED is also Blue.
The Absolute Beginner's Guide may not be totally up to date. My smaller NanoVNA-H has a Red battery LED that is steady on while charging and it then goes out at full charge.
It was the different operation on the smaller NanoVNA-H that initially prompted the question.
Thanks, Kent
AA6P
