Krisztian Gyuris

Yes, it is possible. Here is the modified code that closes the currently open accordion automatically once a new one is clicked: 

var acc = document.getElementsByClassName("accordion");
var i;

for (i = 0; i < acc.length; i++) {
 acc[i].addEventListener("click", function() {
   let activeAccordions = document.querySelectorAll(".accordion-div .accordion.active");
   for (let j = 0; j < activeAccordions.length; j++) {
     activeAccordions[j].classList.remove("active");
     activeAccordions[j].nextElementSibling.style.maxHeight = null;
   }

   var panel = this.nextElementSibling;
   if (!this.classList.contains("active")) {
     this.classList.add("active");
     panel.style.maxHeight = panel.scrollHeight + "px";
   } else {
     this.classList.remove("active");
     panel.style.maxHeight = null;
   }
 });
}

So when the accordion is clicked, I try first to find all currently active accordions, remove the active class, and reset the maxHeight of the panel.  Then check the current panel to see if it is active and if not, the active class is added, and changing the maxHeight to scrollHeight. 
 

I also created a sandbox to demo the component:

https://codesandbox.io/p/sandbox/friendly-julien-tvc882