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hello, i know car battery amps range from 40 amps to whatever, i just cant understand them, the amps aren't printed on the batteries and i don't know why? i have a pretty good ideal that my car battery maybe 45 amps, what does this mean? i know the alternator produces 55 amps, if i hooked a 100 watt light bulb up to my 45 amp car battery i know that the light bulb uses 100w/12v = 8.3 amps, so how do i figure how long the 45 amp battery will run a 8 amp bulb?