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A lot of us are of the view that doing without refrigeration isn't anymore realistic on a boat than it is in our home.
Having said that, mixing old and new batteries, although generally not recommended, is not always a terrible thing to do - it is a generality and there are exceptions, among which is primarily the consideration of how mis-matched they would be in the sense that the internal resistance should be similar, capacity ratings should be similar and obviously the technology should be similar.
Mixing old and new batteries can be done and only requires some due diligence to what you are mixing.
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