The UPS is unable to provide backup output, which is generally caused by the low storage capacity of the internal battery. At this time, we should first charge the UPS, and then cut off the power input of the UPS after the charging lamp goes out. However, if the charging lamp goes out immediately after starting charging or stays on for a long time, and the backup output cannot be provided after the mains power is cut off, most of the cases are that the battery inside the UPS is damaged and cannot store energy. In this case, the problem can only be solved by replacing the battery. Of course, the damage of the UPS internal charging circuit or inverter circuit may also cause this phenomenon. Honeycomb carton to achieve the effect of shock and scratch resistance.