Thanks for the follow up. Double checked, poles are live regardless of switch on or off. In fact, the dangle/clamps are measured @ 15+V as soon as it plugs in, regardless of the switch position. Also today, I follow the instruction manual, switch on, plug in cable, then connect to car ... there's a huge spark.
I couldn't find any direct claim that the Roav 800A Jump Starter Pro is spark proof, something even the cheapest units promised. Can you help verify the above on your unit? It's indeed odd that the product has a switch with absolutely zero effect, and missing some most basic safety features.