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I am using Christmas tree lights (nothing special ordinary lights). We lined the hearts with copper tape. The battery is overheating as soon as we're connecting the wires. I'm wondering if it's because my batteries are alkaline 9volt batteries. I just got the cheapest ones from Amazon. We love love the project...not giving up yet! I'll grab some batteries from the Dollar Tree. I just want to make sure the kids are safe when connecting everything. Thanks