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So, then, what is different about the construction of a "deep-cycle" 
battery, such as those marketed as such for use in golf carts?
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From: "Robert L. Nuckolls, III" <nuckolls@aeroelectric.com
>
>>A few years back I did some research into batteries for an underwater
>>propulsion device and I learned that the number of cycles that you got
>>out of a battery decreased with the percent discharge of the cycles.  So
>>I am wondering what the effect on battery life is when you discharge it
>>to 5-10% of its capacity.  Is that the only way to test the battery?
>
>    It's true that a battery's life is improved by limiting the
>    depth to which you discharge it on each cycle.
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