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ok.. lesson time.
Voltage is the amount of electrons present. Amperage is the FLOW of electrons, thus, a quantity of power. Your amp when it hits hard, will draw the same amount of Voltage, but a higher amount of Amperage. Your car's battery has 12V @ X amount of Amps. (abbreviated to A)
When your engine is running, its recharging the battery, and powering the car as well. Your stock alt does ~14.4V @ 110A. Which varies as your car's rpm raises and lowers. (higher rpm = more amperage) At idle, the output is somewhere around 85-90A.
Your battery normally holds 300-400A (varies due to ambient air temp) Once thats drained (due to chemical nature of lead acid batteries) they don't recharge well.
If your planning a system, get a optima red or yellow top from Silentalero. If your not, stock battery is fine. Get a overdrive pulley for your alternator from ExcessiveAmperage.com (cargodz is the member on here who owns?/works there) If your going big w/ your sound system (ryan can quote Watts per power drain if you need specifics) then upgrade your alternator to a high output one. (i opted for high output AND overdrive pulley)
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