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The amp draw will determine the intensity of the spark. No amp draw no spark. If you connect the + and - lead directly that is a short and a big spark because there is no resistance anywhere other than the wire itself. You are correct, this is how welders work, just huge amp draw and much higher voltage. Now, put a light bulb in between the leads, such as using a test light, and the bulb is the resistor to reduce amp draw and you will get a spark but not very intense. On the other hand if there is no amp draw that means there is no connection from the + to - poles of the battery anywhere in the system there will not be a spark. In other words, connecting a wire, that is not connected to anything else, to a battery will not produce a spark. So, if you get a spark you need to determine where the amp draw is. If it is intentional then you can switch that off and no issues. Otherwise there is a short or draw somewhere and even if it not an intense spark it will drain the battery.

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