Although battery boosters are lighter and easier to carry around I think you would be better off with a leisure battery. I have both in my caravan and I use my battery booster for running a small B&W TV/CD/Radio. General light use it lasts about 3 days. If you are running lights and other electrical equipment from it, it won't last long. The leisure battery on the other hand hardly uses any power at all for lights and water pump so it could take the little TV as well if I wanted, and would last a fair while I should think.
Mine is 17ah battery booster with one 12v socket and the jump leads of course. Below are the figures it gives on the instruction leaflet which may help you :-
Flourescent lights, cell phones....4 watts....30 hours
Radios, fans, depth finders....9 watts....21 hours
Camcorders, VCR's, spotlights....15 watts....12 hours
Electric tools, bilge pumps....24 watts....7 hours
Electric coolers....48 watts....3 hours
Air compressors, car vacuums....80 watts....1.5 hours
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