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before adding multiple batteries you might want to look at replacing it with a single bigger one... of course that's an extra investment, but at some point a battery will have to be replaced anyway, so that might be a good time to look at it. what you want to look at is the Ampere/hours rating wikipedia give's a good explanation of this
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Ampere-hours (A·h) is the product of the time that a battery can deliver a certain amount of current (in hours) times that current (in amperes), for a particular discharge period. This is one indication of the total amount of charge a battery is able to store and deliver at its rated voltage. This rating is rarely stated for automotive batteries.
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batteries for diesel cars or bigger vehicles tend to be higher rated... the advantage is that although it might be slightly bigger it could still fit in the original location, and you don't add that much weight your car...plus you don't have to do any extra wiring...
the average car seems to be between 50 and 75, but i've seen big batteries for like a range rover with has over 100Ah... they do come at a price but... multiple batteries will also have to be replaced at some point... so the theoretical cost would be about the same, and the resulting setup would be more stable
on the other hand, while perhaps more involving you could look at updating the alternator to a more efficient on, so that it tops off the battery much quicker...
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