I like the battery theory, but I measure 4.1 volts across the battery
terminals with the unit turned on (battery is marked 3.7v) and the device
behaves exactly the same way when plugged into the charger with the battery
disconnected. Neither of those seems consistent with the battery being the
problem.
Jim
On Thu, Oct 24, 2024 at 9:26?PM Jim Shorney via groups.io <jimNU0C=
[email protected]> wrote:
You battery is likely bad. Lithium based batteries do not like to be deep
discharged. It will kill them. The VNAs have a very small but finite
current drain when powered off and need to be occasionally maintenance
charged if not used for long periods.
On Thu, 24 Oct 2024 07:21:02 -0700
"Jim Ancona N1ADJ via groups.io" <jim@...> wrote:
I've used my NanoVNA-H4 periodically for several years. Yesterday I
charged it, then upgraded the firmware from NanoVNA-H4-SI_20211230 to
NanoVNA-H4-SI_20211230. I re-calibrated and started doing some testing with
it apparently working fine. I got distracted for a few minutes, and when I
checked the screen was black. I powered it off, then back on, but the
display only appeared for a second, then went black.
--
73
-Jim
NU0C
