What are the electrical performance indicators of the lithium battery pack of smart phones and how to measure them?

There are many electrical performance indexes of lithium battery pack of smart phone. Only the most important electrical characteristics are introduced here. A. capacity of lithium battery pack of smart phone. This indicator reflects the amount of electric energy that can be stored in a lithium battery pack, in milliampere hours. For example, 1600mAH means that a lithium battery can be continuously discharged at 1600mAH for one hour. Packaging life of lithium battery for smart phone. This index reflects the number of repeated charge and discharge cycles of lithium battery pack. C. Internal resistance of lithium battery pack of smart phone. It has been mentioned above that the smaller the internal resistance of the lithium battery pack, the better, but it cannot be zero. D. Upper limit protection performance of lithium battery pack of smart phone. When a lithium battery is charged, its upper voltage limit has a rating. In any case, the voltage of lithium battery is not allowed to exceed this rating. The rating is determined and guaranteed by the IC selected on the PCB. E. Protection performance of lower discharge limit of lithium battery pack of smart phone. When the lithium battery pack is discharged, the voltage of the lithium battery is not allowed to be lower than a certain rating under any circumstances. The rating is determined and guaranteed by the IC selected on the PCB. It should be noted that in the mobile phone, when the lithium battery pack is discharged, the mobile phone will be turned off due to insufficient battery power before reaching a lower protection value. F. Short-circuit protection characteristics of smart phone lithium battery pack When the exposed positive and negative plates of the lithium battery pack are short-circuited, the IC on the PCB should immediately judge and respond, and turn off the MOSFET.