I conducted a small test with IP5303.
IP5303 does not work longer than 30 seconds with a load that consumes less than 65 milliamps. Nanovna consumes 90-110mA.
With such a current consumption, IP5303 should power the device for a long time, until the battery energy is depleted.
Test with the new IP5303, connect a 47-38 ohm resistor parallel to the capacitor C47.
If IP5303 will turn off at a load current of 100mA, then IP5303 is fake, or the elements in its bundle are faulty, although there are few of them.
