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Orv brings up a great point. Do not ADD a battery to an existing battery. The older weaker battery will turn the new battery into an older weaker battery. It's best to purchase and install in pairs just like what all other multi-battery devices recommend.
The vendor where you purchase the batteries should be able to recommend a battery box for 6v or 12v batteries. As far as handy, if you know how to replace one battery, then installing a second is not hard.
If you are not sure here's how to install a two battery system: A.) For 12v you connect both batteries with a proper wire with Positive to Positive and Negative to Negative. Then connect the Positive of ONE battery to the RV positive (usually the red wire), then connect the Negative of the OTHER battery to the ground wire (usually white or black wire). DO NOT make the rig connections to the SAME battery!! B.) For 6v you MUST do this in pairs and you connect the Negative of one battery to the Positive of the other battery for both batteries. This in-series connection means that both batteries now provide the 12v needed. Then the Positive of one battery is connected to the RV and the Negative of the OTHER battery is connected to the RV ground. Again, DO NOT make the rig connections with the SAME battery (corrected per GKerlin).
If you are so inspired let us know if you need help with a 4 battery 6v system. You might think about this since you want the batteries to be of the same age, brand and type.
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