What are the reasons why the battery cannot be charged?

[OliveFitz]

Reasons why the battery cannot be charged: When the vehicle is turned off, the equipment inside the car remains in a working state, continuously consuming the battery's power. After deep discharge, severe battery degradation may prevent it from being recharged. Additionally, an aged generator belt can also lead to charging failure. The battery is an essential part of a car and can be divided into traditional lead-acid batteries and maintenance-free batteries. Since the battery uses a lead-calcium alloy for the grid frame, the amount of water decomposed during charging is minimal, and water evaporation is also low. Coupled with a sealed structure for the casing, the release of sulfuric acid gas is very limited. Compared to traditional batteries, it has advantages such as not requiring any liquid addition, easy connection to terminal posts, and long power storage duration.

[OWyatt]

Common reasons for a battery not charging include battery issues such as sulfation or aging, which increase internal resistance and make it difficult to accept charge; charging system failures like a malfunctioning voltage regulator in the alternator leading to insufficient output; and poor wiring connections such as corroded terminals or loose wires interrupting current. Environmental factors are particularly important, as extremely low temperatures can cause electrolyte freezing, reducing reaction rates. Poor usage habits, such as frequent deep discharges, can also damage battery life. When troubleshooting, start with simple checks like cleaning terminals and measuring voltage—if it's below 12V, the battery may be dead. Regular maintenance can prevent this issue and avoid the risk of being stranded while driving. It is recommended to seek professional diagnosis and repair as soon as possible.

[LaAmara]

I've experienced several battery issues where charging fails due to several reasons: internal short circuits or sulfate crystal buildup blocking charging, insufficient alternator output or unstable voltage rendering charging ineffective, corroded cables or dirty contact points interrupting current flow, and particularly in cold weather when lower temperatures make charging more difficult. Deeply discharged batteries also struggle to recover. My advice is to avoid prolonged vehicle inactivity in daily use. If charging fails, first try cleaning and tightening the terminals before testing. If there's no improvement, replace the battery directly to prevent unexpected failures - after all, driving safety comes first.

[SanAniyah]

The main reasons for a battery not charging can be briefly summarized as follows: the battery itself is damaged (e.g., lifespan exhausted, internal structure damaged), the charger or generator is faulty and unable to supply sufficient current, poor cable connections with corroded terminals causing improper contact, extremely low temperatures reducing charging efficiency, or the battery being deeply discharged and unable to charge normally. For daily handling, first check the terminal condition and keep it clean. If issues persist, visit a repair shop to test the battery's health and replace it if necessary to avoid risks.