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<blockquote data-quote="GO-N DEF" data-source="post: 1547561" data-attributes="member: 564681">Look at it this way...Say your car is not running.&nbsp; You are drawing all of your power from the battery.&nbsp; Now if you have two, taking for granted you have 2 of the same batteries charged exactly the same, you can listen for twice as long.&nbsp; Or, you would notice voltage dropping 1/2 as slowly.Now, if you start your car and turn the system off, the inverse happens.&nbsp; Two batteries take twice as long to charge to full capacity as one would.Now, while running and the system is on, unless you play a single tone, the amps are drawing power intermitatntly with the beat of the music.&nbsp; The voltage regulater will notice a drop in voltage and signal the alt to start adding more current to the battery.&nbsp; If you have 2 batteries, you have more of a power reserve than with only one battery.So yes, a second battery will help even with a stock alt, just make sure you wire it correctly...Everyone else, go ahead and blow holes in the above........</blockquote>

[QUOTE="GO-N DEF, post: 1547561, member: 564681"] Look at it this way... Say your car is not running. You are drawing all of your power from the battery. Now if you have two, taking for granted you have 2 of the same batteries charged exactly the same, you can listen for twice as long. Or, you would notice voltage dropping 1/2 as slowly. Now, if you start your car and turn the system off, the inverse happens. Two batteries take twice as long to charge to full capacity as one would. Now, while running and the system is on, unless you play a single tone, the amps are drawing power intermitatntly with the beat of the music. The voltage regulater will notice a drop in voltage and signal the alt to start adding more current to the battery. If you have 2 batteries, you have more of a power reserve than with only one battery. So yes, a second battery will help even with a stock alt, just make sure you wire it correctly... Everyone else, go ahead and blow holes in the above........ [/QUOTE]

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