In this picture i dont understand why is the 2nd battery (if it was not a starter battery) not connected with a big red cable to the plus pol of the 1st battery. 
asked
Many users use batteries in parallel connection without connection to Starterbattery. Why is there no diagram in the manual for the BMV712smart that shows this circuit variant.
When there are two or more batteries connected in parallel (or in series), the batteries are considered as one battery. That's why it's enough to just draw one red thick cable.
is this the right connection?
Hi Stefanie, many many thanks for your help. I understand this update an i will change my connection yet.
