Two different batteries
There is a risk of batteries not being fully charged if you use a machine-sensed alternator. For instance, a new battery can be fully charged and the old battery may not.
When I have two different batteries, either age or brand, I would switch batteries underway. #1 on odd days or #2 on even days. Both batteries will be fully charged.
Of course, you can always add an ACR to the battery circuit.
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