What is the method to wake up a BYD Tang with a dead battery?

[VonSteven]

Open the driver's side door of the BYD Tang. Release the electronic parking brake switch of the BYD Tang. Press the brake pedal of the BYD Tang all the way down until it can't be pressed further, to prepare for starting the engine. Press the one-button start key of the BYD Tang. All the dashboard lights of the BYD Tang will illuminate, indicating that the engine has been successfully started.

[Myra]

I once encountered a dead battery situation with my BYD Tang, and it was really stressful at that time. Later, I learned a method from an experienced driver: first, use the mechanical key to pry open the cover on the driver's door handle, then twist the key to unlock the door (be careful not to pull too hard, as the plastic parts can break easily). Next, open the hood, attach the red clip of the emergency jump starter to the positive terminal of the battery, and the black clip to any metal part of the engine block (avoid connecting directly to the negative terminal to prevent short circuits and sparks). After connecting, don't rush—wait for three minutes to let the ECU system restore its signal, then get in the car, press the brake pedal, and hit the start button. If it doesn't respond the first time, don't panic; repeating the process two or three times usually wakes it up. Once started, immediately drive on the highway to recharge or go to a repair shop to check the battery's health, since hybrid car batteries are much more expensive than regular ones. Also, remember to turn off the dashcam after locking the car to avoid draining the battery and going through this hassle again.

[VonNicole]

Last time I helped a friend troubleshoot the BYD Tang's dead battery issue and summarized a set of wake-up procedures. Step one: Confirm the vehicle is completely out of power—no response when pressing the key fob unlock button, and the brake pedal feels stiff. Step two: Find a 12V emergency power source (a high-capacity power bank or professional jump-starting device will work), lift the cover on the right side of the engine bay to locate the battery. When connecting the power, be careful not to mix up the positive and negative terminals—the positive terminal is marked red, and the negative must be grounded to a body screw (connecting directly to the battery negative can damage the BMS system). Wait about five minutes until the vehicle's computer completes its self-check, indicated by a humming sound, before pressing the brake to start. Many people fail to start it directly because they don’t give the computer enough wake-up time. Additionally, newer Tang models have an emergency rescue port at the rear—using a DC charging pile can also activate the low-voltage system, which is suitable when there’s a charging station nearby.

[IsabelaLee]

The key to waking up a BYD Tang is to recharge the 12V auxiliary battery. The battery is usually located in the engine compartment above the front passenger-side wheel. Remove the decorative cover to expose the terminals marked with positive and negative signs. Jump-starting is straightforward: connect to another vehicle or a portable power source, positive to positive (red to red), and negative to a metal part of the body (such as a suspension bolt). After connecting, wait two minutes for the system to self-activate—the dashboard lights may flicker during this time. Then, press the regular start button as usual. Remember not to turn off the engine immediately after waking it up; drive continuously for at least half an hour to allow the alternator to recharge the battery. If it's an older vehicle that frequently loses charge, there's an 80% chance you'll need to replace the battery. For long-term parking over two weeks, it's best to disconnect the negative terminal or purchase a solar charging panel to place under the windshield.

[TimothyMarie]

Practical Experience Sharing for Jump-Starting the Tang: First, ensure you have a jump starter or another vehicle capable of providing a jump start. Open the front hood and locate the red terminal marked with a '+', connecting it to the positive terminal of the power source. Do not connect the negative terminal to the battery itself (to prevent sparking); instead, clamp the black clip onto an exposed screw on the vehicle frame. After successful connection, wait for three to five minutes. During this time, the dashboard may display warning lights, which can be ignored. When entering the driver's seat, pay special attention—do not press the brake pedal initially! Simply press the start button once to power on the vehicle for self-inspection. Wait for the central control screen to light up, then firmly press the brake pedal to start the engine. Immediately after waking up, check the battery icon on the dashboard. If a red cross is displayed, promptly visit a 4S store to test the battery capacity. When operating on rainy days, wear insulated gloves, as the risk of electric leakage in the 48V system is higher than in conventional vehicles.

[LaDaniela]

The BYD Tang's dead battery wake-up requires careful steps. First, use the mechanical key to open the door to save power (smart keys consume more power), then locate the 12V battery at the rear right of the front engine compartment. When connecting the power source, use a multimeter to check the voltage—if it's below 9V, charge it for five minutes before attempting again. Remember the jump-start sequence: 'positive first, then negative.' Clamp the positive terminal firmly to the power source, and connect the negative terminal to an unpainted spot on the engine block. Once power is connected, you'll hear the relay click—don't rush to start the car immediately. Wait until the central control screen displays the time before proceeding, and avoid turning on the headlights or AC during charging. After a successful start, promptly check the standby current, as it might be caused by power drain from devices like dash cams or OBD equipment. From personal experience, keeping an emergency jump starter in the center console is the most reliable solution, especially important during winter driving.