I have decommissioned my 18650 Battery and have now 16 V4.4 module boards and 1 controller board for sale.
[Updated 29 July 2023 - Moderator (RW)]
See pictures. All was working perfectly fine for around half a year, before put out of operation
because I have switched to LiFePo4. If someone interested, please let me know. I will gladly hand over those modules for the parts price. The delivery within Germany and also EU possible. The display for the controller board is one size bigger, than required (wrong order =)) ) but it could be installed on extended pins or on wires.