Hi,
I inquired the seller about this, he replied me that the output and input are
12V 3A and 12V 9A for each single charge port, they tested this charger before, full time is about 100 mins, I will try it.
I found a charger on Amazon incidentally, descriptions state the charger can charge 3 batteries at the same time -80-100 mins, anyone tried thi before?