What happens when using a 48V to jump-start a 12V car?

[Laura]

At best, the wires may smoke; at worst, the battery could explode. Jump-starting: Jump-starting, also known as a boost or jump lead start, involves connecting another vehicle's battery or an external power source to a vehicle with a depleted starting battery to start the engine. Once the vehicle is running, its normal charging system can recharge the battery, allowing the auxiliary power source to be removed. As long as the vehicle's charging system is functioning properly, normal operation will restore the battery's charge. Car battery maintenance methods: Start the car regularly to charge the battery; replenish with distilled water or a specialized battery fluid when electrolyte levels are low; routinely check if the battery vent caps are clear during daily driving, etc.