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Car battery discharge warning: What should we do?

Car battery discharge warning is not far away from everyone. It may happen at any time. Essentially, when your car battery drains power faster than it can be charged, you’ll suddenly see a warning on any information panel, such as your dashboard or touch screen. Many people often don’t know how to respond when they see this kind of reminder for the first time, and some people choose to ignore the message. First of all, when we first see this warning, it does not mean that the battery has been damaged. It is just a system reminder that if you continue to follow this trend, the battery may not be able to continue to work normally or even be damaged due to excessive discharge. So we don’t need to panic too much; calm down and find the problem and fix it. Of course, ignoring this information is incorrect.

Why do we get warnings? How should we troubleshoot or prevent this from happening? Let us learn about this problem together today. I believe you will not feel confused when you encounter similar problems in the future.

No, this is just the system reminding you that the current discharge rate of the battery is greater than the charging rate. If you continue, there will be a risk of over-discharging, not that it is already over-discharged. This is just a warning, not a result.

You may see this warning on any platform that can receive information, such as a car dashboard, entertainment touch screen, car projector, or even a mobile phone connected to the car.

Yes, if you ignore the system’s reminder, the battery will continue to discharge until it is over-discharged, which will cause irreversible damage to the battery. Once the battery pack is over-discharged, it may cause permanent damage, causing the battery to be unable to be used normally. You can only continue to use it by replacing the battery.

Some high-end models are designed with a battery protection mechanism that will be automatically activated when a discharge warning occurs to reduce battery discharge and protect the battery. If the charging rate of the battery is greater than the discharging rate at this time, the warning will automatically disappear. But if the problem persists, you need to think about finding the cause and solving it.

Traditional car batteries are lead-acid batteries, but more and more people are choosing lithium-ion batteries, which are more durable and stable. When supercapacitors are added to the battery pack, the battery pack can also instantly release high-power current like a lead-acid battery. Usually, car batteries have a voltage of 12V.

Usually, car batteries are used to power the engine and on-board electrical equipment, such as lights, radios, etc.

Under normal circumstances, when the car engine is started, the engine can continue to generate electricity for the circuit consumption of the car and charge the battery at the same time. When there is a problem with the battery (such as over-discharge), if you are using a lithium-ion battery, you can try to recharge the battery with a small current. When the battery voltage reaches the recovery voltage set by the BMS, the battery pack can resume work.

  • Too cold or too hot ambient temperature: The battery does not work correctly at any temperature. It has its operating temperature range. Temperatures higher or lower than the range may cause the battery to fail to work correctly, thus issuing this warning.
  • Vehicle-mounted effects or audio-visual equipment: The battery usually needs to be charged by the engine. Once the engine is turned off, the battery will only be discharged but cannot be charged. The car stereo or radio will consume much battery power, eventually exhausting the battery.
  • Forgot to turn off the headlights: Headlights tend to have high power, and turning them on for a long time will consume a lot of battery power, causing the battery to run out.
  • The battery cable is loose: Due to long-term vibration, the screws fixing the terminal may become loose, which will reduce the contact area and increase the external circuit resistance, ultimately increasing power consumption.
  • Oxidation of battery interface: Due to accidental water intrusion, the humid environment may cause the terminal part to be oxidized and unable to conduct electricity normally. It will also increase resistance, thereby increasing energy loss.
  • The car charger consumes the battery for a long time: If you use a cigarette lighter to charge your phone while the engine is turned off, this will continue to drain the battery and may cause the battery to over-discharge.
  • Consumption of car wipers, electric windows, electric seats, and air conditioners: These devices all use battery power, so frequent use of these devices with the engine off may cause over-discharge.
  • The battery is approaching the end of its lifespan: Due to long-term use, the battery pack’s capacity has been seriously reduced, and it cannot work correctly.
  • The vehicle’s driving time is too short: Although the battery can be charged while the engine is running, the charging speed is limited. If the car is driven too short, the engine will not have time to fully charge the battery, which will cause the battery to gradually over-discharge in the long run.

  • Avoid exposing the battery pack to extreme temperatures: For example, if you park your car in a temperature-controlled garage in the cold winter, it will protect the battery better than parking it outside in the cold.
  • Do not use the car audio or radio with the engine turned off.
  • Try not to use the headlights for a long time with the engine turned off: If you must use it, remember to turn it off in time.
  • Check-in time to see whether the battery connections are tightly connected and not loose.
  • Check whether the battery interface is oxidized in time. If there is any abnormality, please replace the terminal in time.
  • When charging in-car devices for an extended period, consider turning the car engine on rather than leaving it off.
  • If you need to use wipers, electric windows or electric seats, air conditioning, etc., for a long time, please turn on the car engine.
  • If the battery pack is aging, it can be solved by replacing it with a new battery in time.
  • Try to avoid extensive use of on-board equipment during short trips:
    If you need to use it, keep the engine on even if the vehicle is stopped.

  • Battery grounding error: The battery’s grounding line is not connected according to specifications, or the connection line is abnormal due to long-term use. This could cause the ground wire to unintentionally drain the battery pack, which would provide power to the ground, which defeats the original purpose of the ground wire design, which was to prevent battery fires caused by accidental short circuits.
  • Serpentine Belt does not work properly: If the Serpentine Belt accidentally breaks or slips, it may cause the gear set not to work properly and ultimately cause the alternator to be unable to receive normal power supply, which will directly cause the battery pack to charge slowly or even fail to charge.
  • Battery charging circuit failure: Since the vehicle battery needs to be charged by the engine, if the charging circuit is abnormal, it will directly cause the battery to be unable to charge, or the charging efficiency will be low. This is also one of the common reasons for discharge warnings.
  • Alternator damage: The alternator may not be working correctly due to accidental physical injury or not working properly due to life issues. We can troubleshoot the problem step by step.
  • The automatic driving system consumes too much: the automatic driving system requires multiple sensors, cameras, data processing devices, and wireless communications
  • Excessive consumption of GPS system: When the vehicle positioning system is working, it may cause excessive power consumption and cause abnormalities. Common global positioning systems include GPS, Beidou positioning system, etc.

  • Check whether the battery grounding is normal: if you find an incorrect grounding method, please repair it immediately.
  • Check whether the Serpentine Belt is working correctly: ensure there is no slipping, breakage, etc. If there is any abnormality, you can try to solve it or replace the Serpentine Belt.
  • Check whether the battery charging circuit is normal: You can use a multimeter to measure the voltage at both ends of the battery to see if it reaches the standard charging voltage when the engine is running. Otherwise, please check the circuit condition and repair the abnormality.
  • Check whether the alternator is damaged: first, check whether there is any obvious abnormality in the appearance, and then consider it based on the working time of the alternator.
  • Check whether the power consumption of the automatic driving system is abnormal: You can perform troubleshooting according to the operation guide to determine whether the power consumption is normal power.
  • Check whether the vehicle positioning system consumes abnormally: refer to the solution for the automatic driving system, and you can troubleshoot according to the user manual.

Author Profile

Thomas Chen

Thomas Chen is a seasoned expert in the new energy industry, with a focus on lithium battery technology. A Shenzhen University alumnus, class of 2010, Thomas has cultivated a wealth of experience through pivotal roles at EVE and BYD. Renowned for his profound insights into the sector, he possesses a unique aptitude for identifying market trends and understanding customer needs. His articles offer a distinctive perspective, drawn from a rich background in the field.

Leave the first comment

Car battery discharge warning is not far away from everyone. It may happen at any time. Essentially, when your car battery drains power faster than it can be charged, you’ll suddenly see a warning on any information panel, such as your dashboard or touch screen. Many people often don’t know how to respond when they see this kind of reminder for the first time, and some people choose to ignore the message. First of all, when we first see this warning, it does not mean that the battery has been damaged. It is just a system reminder that if you continue to follow this trend, the battery may not be able to continue to work normally or even be damaged due to excessive discharge. So we don’t need to panic too much; calm down and find the problem and fix it. Of course, ignoring this information is incorrect.

Why do we get warnings? How should we troubleshoot or prevent this from happening? Let us learn about this problem together today. I believe you will not feel confused when you encounter similar problems in the future.

No, this is just the system reminding you that the current discharge rate of the battery is greater than the charging rate. If you continue, there will be a risk of over-discharging, not that it is already over-discharged. This is just a warning, not a result.

You may see this warning on any platform that can receive information, such as a car dashboard, entertainment touch screen, car projector, or even a mobile phone connected to the car.

Yes, if you ignore the system’s reminder, the battery will continue to discharge until it is over-discharged, which will cause irreversible damage to the battery. Once the battery pack is over-discharged, it may cause permanent damage, causing the battery to be unable to be used normally. You can only continue to use it by replacing the battery.

Some high-end models are designed with a battery protection mechanism that will be automatically activated when a discharge warning occurs to reduce battery discharge and protect the battery. If the charging rate of the battery is greater than the discharging rate at this time, the warning will automatically disappear. But if the problem persists, you need to think about finding the cause and solving it.

Traditional car batteries are lead-acid batteries, but more and more people are choosing lithium-ion batteries, which are more durable and stable. When supercapacitors are added to the battery pack, the battery pack can also instantly release high-power current like a lead-acid battery. Usually, car batteries have a voltage of 12V.

Usually, car batteries are used to power the engine and on-board electrical equipment, such as lights, radios, etc.

Under normal circumstances, when the car engine is started, the engine can continue to generate electricity for the circuit consumption of the car and charge the battery at the same time. When there is a problem with the battery (such as over-discharge), if you are using a lithium-ion battery, you can try to recharge the battery with a small current. When the battery voltage reaches the recovery voltage set by the BMS, the battery pack can resume work.

  • Too cold or too hot ambient temperature: The battery does not work correctly at any temperature. It has its operating temperature range. Temperatures higher or lower than the range may cause the battery to fail to work correctly, thus issuing this warning.
  • Vehicle-mounted effects or audio-visual equipment: The battery usually needs to be charged by the engine. Once the engine is turned off, the battery will only be discharged but cannot be charged. The car stereo or radio will consume much battery power, eventually exhausting the battery.
  • Forgot to turn off the headlights: Headlights tend to have high power, and turning them on for a long time will consume a lot of battery power, causing the battery to run out.
  • The battery cable is loose: Due to long-term vibration, the screws fixing the terminal may become loose, which will reduce the contact area and increase the external circuit resistance, ultimately increasing power consumption.
  • Oxidation of battery interface: Due to accidental water intrusion, the humid environment may cause the terminal part to be oxidized and unable to conduct electricity normally. It will also increase resistance, thereby increasing energy loss.
  • The car charger consumes the battery for a long time: If you use a cigarette lighter to charge your phone while the engine is turned off, this will continue to drain the battery and may cause the battery to over-discharge.
  • Consumption of car wipers, electric windows, electric seats, and air conditioners: These devices all use battery power, so frequent use of these devices with the engine off may cause over-discharge.
  • The battery is approaching the end of its lifespan: Due to long-term use, the battery pack’s capacity has been seriously reduced, and it cannot work correctly.
  • The vehicle’s driving time is too short: Although the battery can be charged while the engine is running, the charging speed is limited. If the car is driven too short, the engine will not have time to fully charge the battery, which will cause the battery to gradually over-discharge in the long run.

  • Avoid exposing the battery pack to extreme temperatures: For example, if you park your car in a temperature-controlled garage in the cold winter, it will protect the battery better than parking it outside in the cold.
  • Do not use the car audio or radio with the engine turned off.
  • Try not to use the headlights for a long time with the engine turned off: If you must use it, remember to turn it off in time.
  • Check-in time to see whether the battery connections are tightly connected and not loose.
  • Check whether the battery interface is oxidized in time. If there is any abnormality, please replace the terminal in time.
  • When charging in-car devices for an extended period, consider turning the car engine on rather than leaving it off.
  • If you need to use wipers, electric windows or electric seats, air conditioning, etc., for a long time, please turn on the car engine.
  • If the battery pack is aging, it can be solved by replacing it with a new battery in time.
  • Try to avoid extensive use of on-board equipment during short trips:
    If you need to use it, keep the engine on even if the vehicle is stopped.

  • Battery grounding error: The battery’s grounding line is not connected according to specifications, or the connection line is abnormal due to long-term use. This could cause the ground wire to unintentionally drain the battery pack, which would provide power to the ground, which defeats the original purpose of the ground wire design, which was to prevent battery fires caused by accidental short circuits.
  • Serpentine Belt does not work properly: If the Serpentine Belt accidentally breaks or slips, it may cause the gear set not to work properly and ultimately cause the alternator to be unable to receive normal power supply, which will directly cause the battery pack to charge slowly or even fail to charge.
  • Battery charging circuit failure: Since the vehicle battery needs to be charged by the engine, if the charging circuit is abnormal, it will directly cause the battery to be unable to charge, or the charging efficiency will be low. This is also one of the common reasons for discharge warnings.
  • Alternator damage: The alternator may not be working correctly due to accidental physical injury or not working properly due to life issues. We can troubleshoot the problem step by step.
  • The automatic driving system consumes too much: the automatic driving system requires multiple sensors, cameras, data processing devices, and wireless communications
  • Excessive consumption of GPS system: When the vehicle positioning system is working, it may cause excessive power consumption and cause abnormalities. Common global positioning systems include GPS, Beidou positioning system, etc.

  • Check whether the battery grounding is normal: if you find an incorrect grounding method, please repair it immediately.
  • Check whether the Serpentine Belt is working correctly: ensure there is no slipping, breakage, etc. If there is any abnormality, you can try to solve it or replace the Serpentine Belt.
  • Check whether the battery charging circuit is normal: You can use a multimeter to measure the voltage at both ends of the battery to see if it reaches the standard charging voltage when the engine is running. Otherwise, please check the circuit condition and repair the abnormality.
  • Check whether the alternator is damaged: first, check whether there is any obvious abnormality in the appearance, and then consider it based on the working time of the alternator.
  • Check whether the power consumption of the automatic driving system is abnormal: You can perform troubleshooting according to the operation guide to determine whether the power consumption is normal power.
  • Check whether the vehicle positioning system consumes abnormally: refer to the solution for the automatic driving system, and you can troubleshoot according to the user manual.

Author Profile

Thomas Chen

Thomas Chen is a seasoned expert in the new energy industry, with a focus on lithium battery technology. A Shenzhen University alumnus, class of 2010, Thomas has cultivated a wealth of experience through pivotal roles at EVE and BYD. Renowned for his profound insights into the sector, he possesses a unique aptitude for identifying market trends and understanding customer needs. His articles offer a distinctive perspective, drawn from a rich background in the field.

Leave the first comment

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