On-line UPS power supply, because of its circuit design is reasonable, the driving power components in the allowance of large capacity, and the power supply circuit failure rate is very low, in contrast, caused by the battery failure rate rose to 60% above. Visible, correctly use and maintain a good battery is to extend battery life, one of the key factors of reducing UPS power supply a total failure.
1, regular check
　　Check the terminal voltage and internal resistance of each unit cell. For the 12 V battery unit, if it is found that each unit in the check the battery terminal voltage difference between more than 0.4 V or electric his resistance, when more than 80 m Ω should balance for each cell battery to charge, to restore the battery internal resistance and eliminate the battery terminal voltage imbalance between each unit. Equalizing charge when take charging voltage from 13.5 V to 13.8 V. Treated with good equalization charging the battery can be resistance to the vast majority of 30 m below the Ω.
　　UPS power supply in the process of running, because each unit cell characteristics change over time, resulting in the imbalance of is impossible to rely on the inside of the UPS power supply charging circuit to eliminate, so for this feature has obvious imbalance of battery pack, if not promptly taken offline processing, filling all its imbalance degree is more and more serious.
2, the floating
　　UPS power outages more than 10 days, before the reboot, should be under the condition of without load start UPS power supply to take advantage of the machine of floating battery charging circuit of more than 10 ~ 12 h again on load operation. UPS power supply for a long time in a floating state without discharge process, equivalent to a state of "storage for use". If this state of continuous time is too long, cause the battery failure scrapped due to "store too long", it mainly for battery internal resistance increases, serious when resistance can reach a few Ω.
　　We found that: under the room temperature is 20 ℃, storage after 1 months, battery capacity that can be used for its rating of 97%, if stored for 6 months without, it can use capacity to 80% of the rated capacity. If the storage temperature, it can use capacity will reduce. It is recommended that the user had better every 20 ° C months will pull the mains input, deliberately let UPS power supply working in from the battery to the state of the inverter power. But this should not be too long, the load is about 30% of the rated output, about 10 min discharge.
3, reduce the depth of discharge
　　And it is the life of the battery discharge depth are closely related. UPS power supply of the lighter load, mains power supply is interrupted, battery his available capacities and the greater the ratio of the rated capacity, in this case, when the UPS power supply automatic shutdown due to low battery voltage, battery discharge depth is deep.
　　Actual process how to reduce the battery was deep discharge happened? Method is very simple: when the UPS power at the mains power supply interruption, drawn from the battery to the inverter power supply, the vast majority of UPS power supply will be clearance rings around 4 s periodic alarm, notify the user is provided by the battery energy now. When heard the alarm becomes urgent, means that the power supply has been in the depth of discharge, shall be immediately to the emergency response, close UPS power supply. Not forced in, don't let the UPS power supply has been generally work to the automatic shutdown due to the battery voltage is too low.
4, use during charge
　　For UPS power supply for a long time in a low voltage power supply mains or frequent users, the power was cut off to prevent premature failure due to lack of long-term rechargeable batteries, should make full use of the power supply peak (such as the middle of the night time) to ensure that the battery recharging the battery is enough charging time after each discharge. After general battery is deep discharge, recharging to 90% of the rated capacity at least needs about 10 ~ 12 h.
5, pay attention to the selection of the charger
　　UPS power sealed and maintenance-free battery can't use SCR type "quick charger to charge. This is because the charger will cause the battery at the same time as "instantaneous over-current charge" and "transient overvoltage of bad battery state. This state can make battery available capacity greatly reduced, serious when battery scrap. In the constant pressure type as the charging circuit when the UPS power supply, be careful not to dispatch the battery voltage is too low to protect working point too low, otherwise, at the beginning of the charge it is easy to produce flow charge. Of course, had better choose both has constant current, and persistence of the charger to charge.
6, ensure the power supply environment temperature
　　Battery capacity is closely related to the environmental temperature that can be used. Under normal circumstances, the performance parameters of the battery are calibration under the condition of room temperature is 20 ℃, when the temperature below 20 ℃, the available capacity of the battery he will reduce, and the temperature above 20 ℃, the available capacity will increase slightly. Different manufacturers at different levels of different types of batteries is influenced by temperature. According to statistics, in - 20 ℃, the battery available capacity can reach about 60% of the nominal capacity. The influence of visible temperature can not be ignored.
　　To extend the service life of the battery pack, of course, not only should pay attention to in maintenance use, and when the choice should be fully considering the load characteristics (resistive, inductive, capacitive) and size. Don't make the excessive light load operation of the battery for a long time, so as to avoid the battery discharge current is too small lead to dead batteries.