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What Are the Reasons Why a Car Battery Can't Hold a Charge?

1 Answers
Emiliano
07/30/25 3:59am
There are many reasons why a car battery can't hold a charge: 1. The car has been parked for a long time, causing the battery to lose power. 2. The battery has reached the end of its service life. 3. Insufficient battery electrolyte or leakage. 4. A blown fuse causing the battery to lose power. 5. Corrosion of the battery terminals. 6. Engine damage. Here are some solutions: 1. Use a positive and negative pulse method to depolarize the battery and then fully discharge it. 2. Add water for repair. Only use deionized water or purified water; never use tap water, as it can cause significant self-discharge issues. 3. Additionally, during daily use, avoid situations where there is a large current inflow or outflow, as this can accelerate battery aging.
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What is the Difference Between Sliding Friction and Rolling Friction?

Rolling friction and sliding friction differ in that: the two friction surfaces in sliding friction are fixed, whereas in rolling friction, one of the friction surfaces changes, with the contact points continuously altering. Rolling friction refers to the friction generated when an object rolls over another object; sliding friction refers to the frictional force produced when an object slides along the surface of another object. Friction can be categorized into static friction, sliding friction, and rolling friction, with specific descriptions as follows: 1. Sliding friction: refers to the frictional force generated when an object slides along the surface of another object. The direction of the sliding friction force acting on the object is opposite to its direction of motion, hence friction is produced. 2. Static friction: refers to the scenario where a very small force is applied to push an initially stationary object. Even if the object does not move, it has already generated friction with the ground. The object must overcome the maximum static friction to begin sliding. 3. Rolling friction: under normal circumstances, rolling friction is only 1/40 to 1/60 of sliding friction resistance. Therefore, rolling an object on the ground requires much less effort than pushing it to slide.
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What are the symptoms of BMW braking and driving stability system failure?

BMW braking and driving stability system failure symptoms include weak braking, brake vibration, stiff brakes, brake pedal not returning, and abnormal noises from the brake discs. The causes and solutions for braking and driving stability system failure are as follows: Causes of BMW braking and driving stability system failure: Issues with brake pads or brake discs; problems with the brake fluid in the brake calipers or master cylinder, insufficient brake fluid, or excessive moisture content in the brake fluid; air entering the brake lines. Solutions for BMW braking and driving stability system failure: First, try using the handbrake to see if the car can be stopped. Do not pull the handbrake all the way or too quickly, as this may cause damage or failure of the handbrake. Apply force gradually and gently pull the handbrake to its full extent. Finally, pull the vehicle over to the side of the road and call for assistance.
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When will the Beijing National VI emission standard be implemented?

Previously released draft proposal stating that 'Beijing will implement the National VI emission standard Phase A on January 1, 2019' has been rejected. The official implementation of the National VI standard for light fuel vehicles will be postponed to January 1, 2020. Additional extended information is as follows: 1. Tianjin: The Tianjin Environmental Protection Bureau, Public Security Bureau, and other departments jointly issued a 'Draft for Comments' regarding the National VI policy, which states that the National VI emission standard is planned to be implemented from July 1, 2019. However, this notice is still in the opinion collection stage, meaning that Tianjin will not implement the National VI standard earlier than July 1, 2019. 2. Guangzhou: The originally planned implementation of the National VI emission standard for light vehicles, scheduled to start on January 1, 2019, has been postponed to March 1, allowing citizens more transition time. 3. Shenzhen: On November 1, 2018, Shenzhen took the lead in implementing the National VI policy for diesel vehicles. However, after just one month, it was forced to be suspended. Recently, the Shenzhen Information Committee submitted a 'Request for Instructions on Providing a Transition Period for the Early Implementation of the National VI Emission Standard for Motor Vehicles in Our City' to the Shenzhen Municipal Government. The document states that the implementation of the National VI standard for motor vehicles (new vehicles) in Shenzhen will be postponed to July 1, 2019.
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What are the penalties for being caught with a fake motorcycle license plate?

Motorcycles with fake license plates will be impounded, and the offender may face up to 15 days of detention and a fine. According to the "Road Traffic Safety Law of the People's Republic of China": forging, altering, or using forged or altered motor vehicle registration certificates, license plates, driving licenses, or driver's licenses will result in confiscation by the traffic management department of the public security authority, impoundment of the motor vehicle, detention of up to 15 days, and a fine; if the act constitutes a crime, criminal liability will be pursued according to the law. Below is additional information: 1. Forging, altering, or using forged or altered inspection qualification marks or insurance marks: these will be confiscated by the traffic management department of the public security authority, the motor vehicle will be impounded, the offender may face up to 10 days of detention, and a fine; if the act constitutes a crime, criminal liability will be pursued according to the law. 2. Using another vehicle's motor vehicle registration certificate, license plate, driving license, inspection qualification mark, or insurance mark: these will be confiscated by the traffic management department of the public security authority, the motor vehicle will be impounded, and a fine will be imposed. If the party involved provides corresponding legal proof or completes the required procedures, the motor vehicle will be promptly returned.
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What does the P with a slash mean as a warning light?

The dashboard P light with a slash indicates a parking brake malfunction. In this case, you should promptly visit a 4S shop or repair shop for maintenance. The illuminated P light on the dashboard shows that the electronic parking brake is in the activated state. The parking system is divided into electronic parking brakes and automatic parking. The application of mechanical control electronics is becoming increasingly widespread, and the parking brake has evolved from the traditional lever handbrake to an electronic parking brake button. The function of the electronic parking brake remains unchanged, only the control method has shifted from the previous mechanical handbrake lever to an electronic button. Automatic parking is a function of automatic braking. After activating this function, it simplifies operations by avoiding the use of the handbrake or electronic parking brake, and for automatic transmission models, it eliminates the need for frequent switching between D to N and D to P. The functions of the handbrake are: pulling up the handbrake when parking keeps the vehicle stationary and prevents it from rolling downhill; pulling up the handbrake while turning during driving can create a drifting effect; in emergencies, the handbrake can be used as a brake. Precautions for using the handbrake: avoid pulling it too tight to prevent system damage; avoid parking with the handbrake on long slopes; do not pull the handbrake while driving at high speeds; release the handbrake before starting the car.
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How to Turn Off BMW Daytime Running Lights?

In the vehicle's onboard computer settings, there is a lighting option where you can select to turn them off. Below is an introduction to BMW 3 Series bulb maintenance: 1. Regularly check if the lights are functioning properly: Daily light checks are not just a quick glance. You need to verify that all types of lights are working correctly. Check if the headlights' beam direction is misaligned and if the brightness is sufficient. Regular checks help you stay informed about the condition of your lights and prevent accidents. 2. Replace bulbs periodically: Car light bulbs are consumables with a limited lifespan. Over time, bulbs dim and their illumination distance shortens, which can be a significant safety hazard during night driving. 3. Frequently clean the lamp covers: While driving on roads, it's inevitable for water splashes and mud spots to accumulate on the lamp covers. Although lamp covers are made of special materials with excellent sealing, dirt on the covers not only affects the car's appearance but also diminishes the lighting effectiveness.
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