PowerWalker VFI 6000T LCD - Manual (Page 54)

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8. Battery Maintenance
Battery replacement should be performed by qualified personnel.
This series UPS only requires minimal maintenance. The
battery used for standard models are value regulated sealed
lead-acid maintenance free battery. These models require
minimal repairs. The only requirement is to charge the UPS
regularly in order to maximize the expected life of the battery.
When being connected to the mains power, whether the UPS is
turned on or not, the UPS keeps charging the batteries and
also offers the protective function of overcharging and
over-discharging.
The UPS should be charged once every 4 to 6 months if it has
not been used for a long time.
In the regions of hot climates, the battery should be charged
and discharged every 2 months. The standard charging time
should be at least 12 hours.
Under normal conditions, the battery life lasts 3 to 5 years. In
case if the battery is found not in good condition, earlier
replacement should be made.
Replace batteries with the same number and same type of
batteries.
Do not replace the battery individually. All the batteries should
be replaced at the same time following the instructions of the
battery supplier.
If the battery service life (3~5 years at 25°C ambient
temperature) has been exceeded, the batteries must be
replaced.