Why does the newly replaced battery charger always fail to fully charge?
2 Answers
The newly replaced battery charger may fail to fully charge due to reasons such as insufficient charger current, excessively high charging environment temperature, or mismatched charger parameters with the battery. Insufficient charger current: The charging time is prolonged, and the battery cannot be effectively fully charged within the expected time, causing the charger not to switch off the indicator light. Excessively high charging environment temperature: When the charging environment temperature exceeds 45 degrees Celsius, the charging voltage at the battery terminal cannot reach the limited voltage value, and the charging current remains at a high level, failing to drop to the inflection point current value, thus preventing the charger from switching off the indicator light. Mismatched charger parameters with the battery: This leads to long-term overcharging or undercharging of the battery, eventually causing water loss in the battery and preventing the charger from switching off the indicator light.
I recently researched similar issues and found many possible reasons why a newly replaced charger might not fully charge. The charger itself may have design flaws, such as output current being too low or over-sensitive protection functions, which can cause the charging process to automatically terminate. Regarding the battery, if it's an older model with high internal resistance or internal short circuits, charging becomes difficult. Usage habits also matter—for example, not ensuring tight plug contact or charging in low ambient temperatures can affect charging efficiency. I tested several times with a multimeter and found that the terminal voltage often dropped before reaching full charge. I recommend first checking if the charger specifications match the battery capacity, then inspecting the connection cables and battery health, and upgrading to a reliable brand if necessary to avoid safety hazards. This method is very practical.
