I Wish To Connect My Laptop To A Battery. How Can I Do This? What Is The Capacity Of The Battery?

I am a travelling salesman. I sell VCDs and CDROMs from my van (mobile unit). I wish to connect my Dell Sempron laptop to an external battery in order to display the CDs to my customers at fairs and exhibitions. Will a regular car battery be able to power my laptop for a few hours each day? Will this supplement the battery that is already in the laptop? Can I connect the external battery to the van so that it recharges when the vehicle is running?

Originally posted 2009-09-02 23:15:00.