Dear 999zip999 certainly that I plugged it onto wall socket.
At the output of the charger I have 4 cables: red black yellow white. I don't have the original battery anymore.
Reading between red and black give 0V, between while and red 4.2V,, between black and white 4.8V.
I think that the charger needs to obtain from the bms of the original Panasonic battery a specific value to start the charge. Does anyone Panasonic expert knows the pinout of these chargers?