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I would not try to put different battery types on the same bank, the charging characteristics are different - especially if its unattended. You could run a DC-DC charger off the load side of your regulator, that way it woukd be running through the regulator load fuse, and charge the small battery that way. Another alternative would be to get a small regulated solar panel and simply clip it to the small battery, but that would be more expensive. You can connect more than one regulator to the same bank so if you had a switch you could switch it between the bank and the dob battery but you would need to be there to do that. The most cost effective solution ( like $20) woul d be to put a 12V regulator on the load side of your controller and it will charge you dob battery and maintain float isolated from the bank and fused.
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