What Are the Reasons for a Battery Not Charging?

[StGenesis]

Introduction to the reasons why a battery cannot be charged: 1. The battery is fully charged: A battery in a fully charged state will naturally not accept further charging. 2. Sulfation of the battery's negative plates: This occurs because standard constant-voltage chargers, due to their design settings, may not fully charge the battery. Even if the battery can be charged or discharged during use, insufficient charging will gradually reduce its capacity and shorten its lifespan. 3. Lack of electrolyte: If the electrolyte has dried up, first add distilled water. After adding enough, do not immediately replace the battery's filler cap. Connect a 220V/200W ordinary incandescent bulb in series with the battery (regardless of polarity) to a 220V AC power source at home and observe whether the bulb lights up normally. If it does, continue supplying power for about 1 minute before disconnecting. Wait a few minutes and then reconnect for another minute, repeating this process 3-5 times. Afterward, connect the battery to a charger for a normal 15-hour charging cycle.