Can I hook up a fishfinder and trolling motor to the same battery?

I have a 12′ aluminum boat with a trolling motor and would like to use a depthfinder that I just bought. I’m also not quite sure how to connect the terminal end of the depthfinder to the battery. There are split ends with +/- on the cable. I bought “battery charger and testing clamps” and wondering if I those would work. Thanks!

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