Trickle Charger/Maintainer with eTorque

[Old Jedi]

I have been thinking about one. My question is: I have the newer 3.6 eTorque system, so there is only 1 12v battery up top, and a 48v battery (Li ion) down under. If I understand the system right, the generator charges the 48v battery when running and then the 48v actually charges the 12v via a separate circuit. So, if I put a maintainer on the 12v battery up top, does it have any affect on the 48v battery? Do I need something different? Do I need anything at all?

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[Instaurare]

The service mgr at my dealership said that the 12 volt is independent of tbe 48, so my guess is that the trickle charger charges only the 12V.