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Charge the battery yet? You probably have something not turning off, draining the battery. A stereo and alarm will not make your car take significantly more power to start, unless you start the car with the stereo at full bass blast and it's a monster, monster system. You'll also probably run into the same issue with a larger battery, just a little bit later.
I'm partial to whatever battery is local and cheapest. Just drive down to a local parts store and ask for a battery that has posts of the same type on the same side of the battery but a larger CCA rating. It won't fix your problem unless your battery has gone bad, which it probably hasn't.
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