u/Duallite

Maybe I'm missing something, but anytime I reconnect the 12v battery there's a small spark, I hear the usual car starting sounds like the contactor, then the car alarm goes off. I've watched videos of people changing out the battery, and some mention a small spark might happen but never the car alarm. I've never had an "always on" car before, is there a step I'm missing that would prevent the alarm from going off? This is a 2020 Bolt LT