If your JAC Ruifeng car battery is hot and discharged when charging, it may be caused by the following situations:
1. The battery is old or damaged: The battery may be damaged. after being used for a period of time, it will become old or damaged, resulting in reduced charging efficiency or inability to store sufficient electrical energy. In this case, you may need to replace the battery.
2. Charging system failure: including failure of the charging line, charger or generator, preventing the battery from charging normally. You can check if the charging line is damaged or has poor contact, or try using another charger for charging.
3. Insufficient or contaminated battery electrolyte: Normal battery operation requires sufficient electrolyte. If the fluid level is too low or the electrolyte is contaminated, the battery charging effect will be affected. You can open the battery cover and check if the electrolyte level is normal. If it is insufficient, you can add distilled water. If the liquid is cloudy or has a strange odor, the electrolyte may be contaminated and it is recommended to replace the battery.
No matter what situation occurs, I suggest you take your vehicle to a professional auto repair shop for inspection and repair. They will give you more precise solutions based on the specific situation.