Waking up to a dead battery in your BYD Han is frustrating. This guide walks you through the most common parasitic draws, which modules to check first, and whether it’s safe to keep driving in the meantime.
Common Causes of Parasitic Battery Drain on the BYD Han
If your BYD Han’s 12V battery is flat after sitting overnight, something is staying awake when it shouldn’t. The most frequent culprits on this platform include the telematics (TBOX) module, the infotainment system, or a door/trunk switch that isn’t telling the car to sleep. A faulty DC-DC converter can also keep the high-voltage battery constantly trying to recharge the 12V system, but that’s less common. Don’t forget simple things like an interior light left on or a glove box lamp that stays lit – those draw just enough to drain a battery overnight.
