This really resonates with me because I learned this lesson the hard way. A couple years ago I went with the cheapest battery option from a random shop just to save some money, and within months I started having weird electrical glitches, dashboard warnings popping up randomly, and the AC system acting strange. Turned out the installation wasn't done properly and nobody bothered checking the charging system afterward. Once I switched to a proper specialist who actually tested everything before and after installation, all those issues disappeared. It really changed how I think about battery replacement, it's not just about the battery itself but the whole process around it.