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Take two batteries connected in series as an example. One battery has a capacity of 1C, while the other has a capacity of only 0.9C. In a series connection, two batteries pass through the same amount of current.

When charging, batteries with small capacity must first be fully charged, reaching the charging cut-off condition, and the system will no longer continue to charge. When discharging, batteries with small capacity will inevitably discharge all available energy first, and the system will immediately stop discharging.

In this way, cells with small capacity are always fully charged and discharged, while cells with large capacity are always using a portion of their capacity. A portion of the entire battery pack's capacity is always idle

2) Life loss, similarly, the lifespan of a battery pack is determined by the battery cell with the shortest lifespan. It is highly possible that the battery cell with the shortest lifespan is the one with a small capacity. Small capacity battery cells are always fully charged and discharged, with excessive output, which is likely to reach the key point of their lifespan first. As the lifespan of the battery cells comes to an end, a group of battery cells welded together will die with it.

3) As the internal resistance increases, different internal resistances flow through the same current, and cells with higher internal resistance generate more heat. If the battery temperature is too high, it will accelerate the degradation rate and further increase the internal resistance. Internal resistance and temperature rise form a pair of negative feedback, accelerating the degradation of high internal resistance cells.

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