I read that with interest. He seems to go with the 5 amps is full idea for Li. Like the 4-5% idea in that other ref.
" Why 5 amps and 13.6 volts? Because 5 amps on a 100 AH Pb and LFP is the point both batteries are fully charged."
However he is out to lunch on 5 amps being full on a 100AH lead acid battery of course. EG it is 0.5a/100AH with AGMs. 2-3% is often quoted as being full for flooded batts--if you believe that. (To me full is 100%.) He does not make clear whether that acceptance rate of 5 amps is at 13.6 or 14.4 either, which matters a lot.
So I don't know how much to trust him on Li when he says that about Pb. Again, it does not matter much what I ever figure out; it should matter to those who actually have or will buy Li-ion batts for their RVs.
They are the ones who should be taking over this thread IMO.