A car that starts fine today but needs a jump tomorrow is basically telling you, “Something is stealing my electricity while I sleep.” Annoying, yes—but also very fixable once you know where to look. If you’ve been asking “Why Is My Car Battery Dying Overnight?” , the usual causes fall into two buckets: the battery itself is weak and can’t hold a charge, or there’s an electrical draw draining it when the car is off (often called a parasitic draw). Let’s break down what’s real