Tattu battery info from CAN bus

Hi, I am quite new to CAN and I would like to ask you how can get detail info about my batteries? I have following batteries Tattu Plus DroneCAN Battery — Copter documentation and I would like to read SOH and battery serial number. I have read it shall be possible via Messages (common) · MAVLink Developer Guide. That I shall be able to request the CAN info for all nodes via this request, but I get no response to this. Only info I have is from Messages (common) · MAVLink Developer Guide and I can see the cell voltage for every cell, even the extended voltage is filled. So I believe autopilat has to have access to those CAN info from batteries, but how can I get to it, ideally via mavlink, since I have no connection to CAN yet. And I was able to find this kind of info in hadware report tool using flight log file. Can anyone help? Please?