Confused about sudden car battery drain after recent replacement

Hi everyone, I’m trying to understand something a bit odd that started happening with my car and I’m not sure if I should be worried or not. I recently got my battery replaced because the old one was completely dead one morning, everything seemed fine after the new one was installed, but now I’m noticing the charge doesn’t seem to last as expected. The car starts fine, but if I leave it parked for just a couple of days, it feels slightly weak again which didn’t happen before.

I went back to the workshop and they checked it quickly and said there’s no obvious issue, but I still feel something isn’t right. It’s a bit frustrating because you expect a fresh battery to solve the problem completely, not create new doubts. While reading around, I saw some people saying installation quality and testing matter a lot, especially for high-end cars, and that sometimes going for expert Cadillac battery installation services Dubai can help avoid hidden electrical drain issues that normal checks might miss.

Now I’m stuck thinking whether I should get a second opinion or just monitor it for a while longer. Has anyone dealt with a similar situation where the battery looked fine but still acted weak after replacement? Would really appreciate some real experiences because I don’t want to keep guessing and risking a breakdown later.