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You are doing the wrong calculations - power consumption isn't measured in amps and all batteries and alternators have limits on to how much time they can produce their maximum output. Car batteries are only designed for high output over short periods of time - it's the same with alternators. If you are going to need a high output electrical source in your car you may not only have to uprate the battery but also the alternator to match. Battery output is measured in amp/hours. Also remember the ratings stated on batteries are for when it is new
See link below for an explanation.
Currently in madnoel10's garage:
Honda Civic 1.4l
Last edited by madnoel10; 15th March 2008 at 02:49 PM.