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What are the reasons for a maintenance-free battery not charging?

1 Answers
AnaMarie
07/29/25 8:03pm
The reasons why a maintenance-free battery cannot be charged are that the battery has internal broken plates or short-circuit damage. The maintenance methods for the battery are: 1. Charge the battery in time when the ammeter shows insufficient power; 2. Adjust the density of the electrolyte according to different regions and seasons based on standards; 3. Add distilled water or special replenishing fluid when the electrolyte is insufficient; 4. The total duration of starting the car each time should not exceed 5 seconds; 5. Start the car periodically when the battery is not used for a long time; 6. Regularly check whether the small holes on the battery cover are ventilated; 7. Check whether the positive and negative terminals of the battery are oxidized; 8. Check whether any part of the circuit is aged or short-circuited.
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What are the functions of the Volkswagen Sagitar key?

Introduction to the functions of the Volkswagen Sagitar key is as follows: Locking the car: Press the "Lock" button, and all door lock motors will perform a locking action simultaneously, with the turn signals flashing once. Finding the car: When the vehicle is in anti-theft mode, pressing the "Find Car" button will trigger a long beep and the turn signals will flash for 15 seconds. (Use this function to locate your vehicle when unsure of its position) Pressing the "Find Car" button again during the finding state will re-enter the finding mode. Alarm deactivation: When the vehicle is in the alarm-triggered state of anti-theft mode, pressing the "Lock" button will cause all door lock motors to perform a locking action simultaneously, regardless of whether the doors are open, and the alarm will be deactivated. The vehicle remains in anti-theft mode. Unlocking: Press the "Unlock" button, and all doors will perform an unlocking action simultaneously, with the turn signals flashing twice. If the vehicle is in anti-theft mode when this button is pressed to unlock, the turn signals will flash three times. The "Unlock" button cannot be used to unlock if the key is in the ignition switch. However, if the vehicle is in the alarm-triggered state of anti-theft mode, inserting the key into the ignition switch and pressing the "Unlock" button can exit the anti-theft state and unlock all doors. When unlocking with the remote, the rear interior light and ignition key reminder light will illuminate for about 30 seconds before turning off. (This function is optional; see "Setting Methods for Optional Functions" for details) After unlocking with the remote, doors can be opened within 30 seconds. If no door is opened during this time, all doors will be automatically relocked. Canceling anti-theft state: When the vehicle is in anti-theft mode (including alarm-triggered state), pressing the "Unlock" button will cause all doors to perform an unlocking action simultaneously, with the turn signals flashing three times, and the anti-theft state will be canceled.
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What is the difference between cars running on gasoline and natural gas?

Cars running on gasoline and natural gas differ in the following aspects: 1. Fuel type: Gasoline-powered cars use gasoline as fuel, while natural gas-powered cars use natural gas. 2. Ignition point: The ignition point of gasoline is 427°C, whereas natural gas ignites at 650°C. 3. Fuel storage method: Gasoline is stored in iron-rubber fuel tanks, while natural gas is stored in high-pressure steel cylinders. 4. Economic efficiency: Running on natural gas is cheaper than gasoline, approximately half the cost (depending on specific conditions), but natural gas provides less power than gasoline. This is because most car engines are designed for gasoline, so using natural gas may result in noticeably insufficient horsepower.
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Where to Renew Driver's License in Shangyu?

In Shangyu, driver's license renewal can be processed online for expiration renewal, or you can go to the Vehicle Management Office of the Traffic Police Brigade located at No. 341 Renmin West Road, Shangyu City. The following are details related to driver's license renewal: 1. Renewal Time: The motor vehicle driver should apply for renewal at the vehicle management office where the driver's license was issued within 90 days before the expiration of the driver's license. 2. Expired Renewal: If the driver's license is not renewed for more than one year after its expiration, the driver's license will be canceled. If the driver's license is not renewed for more than one year after its expiration and the cancellation period does not exceed two years, the driver's license can be restored after passing the subject one exam; if the cancellation period exceeds two years, a new application is required.
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What Causes the Rustling Sound When Braking?

The reasons for the rustling sound when braking are as follows: 1. Foreign objects on the brake disc: When driving on complex road conditions, wheels can easily fling stones or other foreign objects. Unlike drum brakes, disc brakes can trap stones between the brake pads and the disc, causing noise when braking. 2. Severe wear of the brake disc: Sometimes the brake disc is directly scratched by foreign objects or hit by other objects, leaving pits on the surface. When the brake pads rub against an uneven brake disc, it can also produce a rustling noise. 3. Severe wear of the brake pads: After a certain period of driving, the brake pads become thinner due to long-term friction. Excessively thin brake pads not only reduce braking effectiveness but also cause noise during braking due to the thinning material.
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What Causes Brake Pads to Overheat and Make Abnormal Noises?

Brake pads making abnormal noises and overheating are primarily caused by the following two reasons: 1. Brake Caliper: Poor retraction of the brake caliper leads to brake drag, causing the brake pads to make abnormal noises and overheat. In this case, it is necessary to stop driving and have the vehicle's brake caliper inspected and repaired. 2. Frequent Braking: Excessive use of the brakes during driving causes the brake pads to make abnormal noises and overheat. While driving, frequent use of the brakes should be avoided as much as possible, as it not only easily overheats and damages the brake discs but may also cause harm to the vehicle's tires, engine, and automatic transmission.
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Is Diesel Exhaust Fluid Toxic?

The scientific name of automotive urea is Diesel Exhaust Fluid (DEF), which is a toxic substance. DEF is used in diesel engines as part of the SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxide emissions from diesel vehicles. More details about DEF are as follows: 1. Composition: It consists of 32.5% high-purity urea and 67.5% deionized water. 2. SCR System: The SCR system includes a DEF tank (which holds the diesel exhaust fluid) and an SCR catalytic reaction tank. The operation process of the SCR system is as follows: when nitrogen oxides are detected in the exhaust pipe, the DEF tank automatically sprays DEF, which then reacts with nitrogen oxides in the SCR catalytic reaction tank through redox reactions, producing harmless nitrogen and water vapor that are released. 3. Usage Precautions: If not used for a long time, urea may crystallize and block the system pipes, leading to higher maintenance costs.
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