The battery voltage limit of the charging bank will affect the end voltage of the charge, and the end voltage is usually lower than the rated voltage of the battery. When the battery is low, there is a certain internal resistance in the cell, which makes the cell need a higher voltage to overcome the internal resistance and be fully charged. Therefore, when the power of the charging treasure is about to run out, the end voltage will be slightly reduced, resulting in the last grid of the charging treasure can not be full.
In addition, it is also possible that the adjustment and design of the circuit of the charging treasure itself is not accurate enough, resulting in the dissatisfaction of the last grid of the charging treasure.
The following reasons may exist if the last grid of the charging bank is not fully charged:
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1. The control circuit of the protection board of the charging bank is damaged, resulting in a voltage detection error, and the last cell has been shown to be not full.
2. The power indicator of the charging bank may be inaccurate.
3. The charger or power cord used is of inferior quality and cannot provide the voltage during normal operation, so it cannot enter the protection state.
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It is recommended that you replace the charger or power cord, or seek the help of a professional to check whether the charging bank is damaged.