by 
The Curious Bag
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<h4 class="dechead">On One Hand: Primary Car Battery Can Be Deep Cycle
A deep cycle battery can be used as the primary battery in a car. In fact, there are many advantages to using a deep cycle battery. For example, you can have the radio and lights on for hours and still have enough power to start the engine.
On the Other: Problem Finding One that Fits
Most deep cycle batteries are larger than car batteries, so there may be a problem finding one that fits in the battery space of the car. A battery box may need to be installed in the trunk, which will mean added expense.
Bottom Line
Deep cycle batteries last longer and are more useful than ordinary car batteries. They can provide auxiliary power for any number of purposes for a long time and still start the engine. They may cost more but if you need the power it is worth the price.
Source:
Pacific Power Batteries: Deep Cycle Batteries: WHAT DO I LOOK FOR IN BUYING A NEW BATTERY?
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