Hello,

A few days ago I purchased a UPS PIco HV4.0B Stack with Lead Acid backup battery, fw version 0150, from a Greek vendor. Intended usage is to prevent SD card corruption of my Raspberry Pi4B (with Moode Audio installed on it), when AC mains voltage is switched off. Pi is powered from the USB-C connection, via the original AC/DC power pack. So I expect my Pi+HV04 to automatically shut down when AC is off for more than 1 min and to automatically return to operation when power input is on again. 

First, I soldered the two pogo pins at the correct locations for the Pi 4 (i.e. at the holes near the SYS LED).

Then I proceeded with setting up the sw environment on my Pi. Here I faced some difficulties during the software setup (I will make another post about that) but finally I managed to install the daemons on my Pi machine and the script for decreasing the I2C Raspberry Pi I2C rate. However, HV4.0 was quite unstable during the transition from normal operation to LPR, so I decided to update the firmware to the latest publicly available version (0179). After this update, the unit is operational but it does not behave as expected. Here is what it happens:

1. When power to Pi is normal, SYS LED blinks every 750 msec.

2. After turning of the DC power to the Pi, SYS LED blinks every 2 sec. 

3. After ~30 sec, and while power to the Pi is off, BAT LED turns on and off quite erratically, in orange color. SYS LED keeps blinking at 2 sec intervals.

4. After 4 min : 45 sec, both SYS and BAT LEDs turn off and Pi is turned off as well.

My main problem is the long time needed for shutting down (4min:45sec). It should be ~ 1 min. And the operation of the BAT LED implies that something worrisome happens here.

If I press the F button:

1. SYS LED is blinking at 2 sec intervals

2. After ~ 5 min, SYS LED turns off but Pi still operates (i.e., it does not turn off)

Here is the status information:

**********************************************
UPS PIco HV4.0 Status
Version 1.4 Relase Date 13.03.2024
Compatible with Firmware 0x0168 and up
**********************************************

System Clock read from Date................: 2025-11-23 22:51:39
System Clock read from HWCLOCK.............: Error: {error_message}
UPS PIco RTC Registers direct read.........: 2025-11-23 20:51:39

UPS PIco Firmware..........................: 0179
UPS PIco Bootloader........................: 41
UPS PIco PCB Version.......................: 54
UPS PIco PCB Defaut Battery................: Battery LiPO 'L' 0x4C
UPS PIco Set Battery.......................: Battery SAL 'A' 0x41

Raspberry Pi Core Temprature...............: 42 C
Raspberry Pi Core Temprature read by PICo..: 44 C
Embedded Fan Temp. Threshold...............: 45 C
Embedded Fan Speed.........................: OFF % of Total RPM

Powering Mode..............................: Cable POWERED
Power Backup Set Mode......................: Battery Backup

Battery Level..............................: 4.3 V
Super Capacitor Level......................: 3.8 V
EPR/PPoE Powering Level....................: 0.0 V
RPi(USB) Powering Level....................: 5.2 V

Running Time on Battery....................: 1 min
Battery Charger Status.....................: ON
Max Allowed Battery charging curent........: 0.44 A
Max Allowed On Board SCAP charging curent..: 0.0 A

Power Source(s) Cable checking timeout.....: 0.3 Seconds
Restart on Hold time.......................: 00 Seconds
FSSD Durtion...............................: 30 Seconds
Firmware loop..............................: Healthy - Running Properly
Still Alive Timer..........................: Timer Disabled
Raspberry Pi OFF waiting time..............: 5 Minutes
Magic Switch Funtionality..................: de-Activated

UPS PIco HV4.0 RS232(s) Setup..............: RPI_RS232_OFF PICO_RS232_OFF
-12/+12 V RS232 Driver Connection..........: none
RS232 PIco routing.........................: not implemented yet
RS232(s) PIco sleep/wakeup data setup......: not implemented yet
RS232(s) PIco sleep/wakeup data received...: not implemented yet

Internal Relay State.......................: OFF
User LED Green Activity....................: OFF
User LED Blue Activity.....................: OFF
Green LED mapping setup....................: none
Blue LED mapping setup.....................: none

A/D Converters Correction Factor...........: 00
A/D Converter 0 ...........................: 0.0
A/D Converter 1 ...........................: 0.0
Opto Coupler/Digital Input Level...........: 0.0