Shouldn't be a problem as long as it's fused. However, as you start to connect more ad more stuff to the battery terminal there comes a point where it's just easier to fit a separate, dedicated fuse box for all your accessories. It means you will only need one connection to the positive terminal (going to the fuse box), rather than a whole pile of them. Much tidier and gives you the option of a spare fuse way or two for a later date.

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