When a lithium battery is fully charged, it shows that it is rechargeable, just like the surface of a full water cup still has tiny bubbles. In fact:
Voltage drop: After charging stops, the voltage of the positive and negative electrodes naturally drops by 0.05 - 0.1V, triggering the charger to make a "recharge" judgment.
Oxidation phenomenon: When charging is stopped, the electrode material has not yet fully stabilized. After being left to stand, some lithium ions will redistribute.
Protection mechanism: Most devices will pause repeated charging when the battery level is ≥ 95%, to prevent overcharging.
II. The Intelligent Logic of the Charger
The operation mode of the charger determines the "repeated recharging" phenomenon:
Flow compensation: When a voltage drop is detected, a small amount of current (approximately 0.02C) is automatically replenished.
Threshold design: Generally, the 93% - 97% power range is set as the repeated triggering range.
Temperature compensation: In low-temperature environments, it will actively increase the cut-off voltage to reserve buffer space.
III. Correct Response Strategies for Users
In such situations, there is no need to worry, but be cautious:
There is no need to manually plug or unplug: modern charging chips will automatically manage the charging process.
Avoid long-term connection: Continuous charging for more than 24 hours may accelerate the decomposition of the electrolyte.
Pay attention to abnormal high body temperature: If the battery temperature exceeds 45℃ during charging, stop using immediately.
Monthly complete cycle: It is recommended to perform at least one complete charge and discharge cycle ranging from 20% to 100%.
