is it my battery ?

alright so i was showing someone my jammer and i had the volume up loud and sub pounding..... watching the volts they never got below 12.75...then i drove home doing about 45 or so b/c of the roads..... i get into town and at idle it was only getting about 14.2 volt to 14.0... i do have a stock battery in that i was going to upgrade tomorrow but could this be the cause of my battery being shot and not taking a charge or is my alt getting weak?

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If you're not dipping below 12.7, you're fine and although it wouldn't hurt, replacing the battery isn't necessary.
I don't get the question here?

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He's worried about the car idling at 14.0. Because it is a common misconception that all cars idle at 14.4, when this is not necessarily true.
You are fine OP.

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just use a fluke and test the voltage your battery is puttin out when the vehicle is at idle and see if it matches the reading of the volt meter inside your vehicle

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**** my bad its 14.1 and 14.0 when idle and from what i have seen it normaly stayed at .24 or so who knows

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