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You have to remember that batteries are a storage medium just like your gas tank. Bigger and better batteries are more "energy dense" and store more power. Switch out the "junk" batteries for good deep cycle ones and you will get a longer run time for your 12v system. If you decide to buy batteries be sure to get "deep cycle" batteries which are different from starting batteries. Starting batteries provide lots of power for a short time (starting the engine), deep cycle batteries provide lower power over a longer period of time, they are more "energy dense."
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