Originally Posted by Havik

My don't drive my 4Runner often, unfortunately, so the batteries sit idle for weeks, sometimes months at a time. I have another "just for fun" car that also sits idle for a long time but that one only has 1 battery so I have it connected to a CTEK MUS 4.3 Battery Charger. I want to do the same for the 4Runner, but the 4Runner has a dual battery setup so I have a bunch of questions.

1. Does the dual battery system even matter for trickle charging?
2. Is it safe to do this?
3. Do I need a special type of charger or would a standard one work?
4. If it is safe, which battery should I hook to, primary or secondary?
5. If this isn't going to work, is there anything else I can do?

I have the IBS-DBS Dual Battery System with Microprocessor and IBS RBM Relay Booster Module. Anyone with experience with a dual battery setup and trickle charging, please let me know how you do it and what you use.

Thanks in advance for any and all help/advice/knowledge you share.