Cascaded batteries refer to the degraded use of batteries, aiming at battery packs. The new battery pack has weakened after a period of use. After attenuation, it is not enough to meet the current application power demand of the equipment, but the battery is not broken. After some maintenance and adjustment, it can be used in equipment that degrades the battery by one level.

Cascade utilization refers to the continuous use process of a used product after reaching its original design life, and then recovering its function in whole or in part by other methods. This process belongs to the mode of basic equivalent or degraded application. "Cascade utilization" and "gradient utilization, cascade utilization and degraded utilization" are basically the same in concept, but they cannot be regarded as transformation utilization. Cascaded batteries refer to repairing used batteries and charging them with old batteries.