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they will suck between 3-6amps - so you wont get a long time with the car battery. deep cycle battery 110 ah will give you about 8 hours before the voltage drops to an unacceptable level and needs a recharge. I had two 110 ah batteries to run the lappy dew heaters and the 3.5ah required for my cooled camera. the laptop was being run directly through a purpose built converter -12 -19v and sucks 5 amps - so be well aware - you will suck the life out of anything in a short while (can go all night though)
Last edited by h0ughy; 21-01-2009 at 10:12 AM.
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