Hi Antti,
Zitat:
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Zitat von Antti
- Are they connected in parallel or are they "totally" independent on each other? The user manual says that there is a switch between them!
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True, there is a switch between the two batteries. The switch is activated as soon as you start charging (i.e. >13,5V).
Zitat:
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Zitat von Antti
- (If they are independent) could I only charge the bigger one with a battery charger? Of course the question would remain how the smaller one would get charged?
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You can charge both of them: according to the BMW TIS you should use the starting points at the engine, and the E38 750 has
two different starting points under the hood:
the starting point (B+) at the front of the engine can be used for charging the starter battery (110Ah), and the other starting point (B+) at the left wheel house (rear of the engine) can be used for charging the other battery (55Ah).
Zitat:
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Zitat von Antti
... how the smaller one would get charged? - Perhaps by the generator when the engine is running
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Yes; as soon as the engine is running the generator is charging both batteries.
HTH. As I do not have two batteries I have no practical knowledge whether this works as described in the TIS.
Regards
RS744