Is your BYD Seal’s 12V battery flat after sitting overnight? Here’s how to diagnose a parasitic draw, which modules to check, and whether it’s safe to keep driving.
It’s never fun to walk out to a BYD Seal with a dead 12V battery, especially when it was parked perfectly fine the night before. While the high-voltage traction battery is usually healthy, this kind of overnight drain almost always points to a parasitic draw on the 12V system. That means something electrical is staying awake when it should be sleeping.
