Labels: Be careful when charging UPS batteries in series. UPS batteries are the key to ensure that UPS can continue to maintain power when the mains or bypass power failure occurs. Many UPS batteries are connected in series and are the weakest link. In the process of using UPS power supply, the general battery specification will state that the charging current should not exceed 0.15CC, which means that the battery will take several times to recharge after the UPS is discharged at full load. In this sense, its availability is generally below 20%. But because the battery does not work continuously, as long as the utility power is restored before the battery is discharged, and there is no power outage during the recharging process, the load will still not be affected. From this point of view, the availability of the battery is still very high in the event of a short-term power outage. However, if the charger is damaged, the battery cannot be recharged after a single discharge, which will cause the load to be cut off in the next mains power outage. However, the charger only works when the battery needs to be charged. Therefore, if the status of the charger can be monitored in time, and the alarm will be reported in time when the charger is found to be abnormal, the problems caused by the charger failure can be avoided and the overall UPS performance can be improved. Availability.