Jony's right.
Think of your soldering iron as a bucket (soldering iron) full of water (heat). If the bucket has a small (10W) hole in the bottom, the water takes ages to flow out, whereas if it had a big (80W) hole in the bottom it comes out very quickly. The water (heat) is still the same temperature but as you get lots of it from the big hole it means it doesn't take as long to fill up a container (soldering a battery bar/motor etc.) Less damage to everything and less chance of a dry joint.
The Weller SP 80L iron is fantastic as it will easily do cells, V2 motor tabs, wires or anything else on your car. Well worth the money, and can be got for no more than £20.00.
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