PowerWalker VFI 1000 LE - Manual (Page 31)

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4.3 Battery Maintenance
1) The battery used for standard models are valve regulated sealed
lead-acid maintenance free battery. It should be charged regularly in
order to maximize the expected life of the battery. When being
connected to the utility 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.
2) The UPS should be charged once every 4 to 6 months if it has not been
used for a long time.
3) In the regions of hot climates, the battery should be charged/ discharged every
2 months. The charging time should be >12 hours.
4) In normal conditions, the battery life lasts 3 to 5 years. If the battery is
found in bad condition, earlier replacement should be made.
5) Do not replace the battery individually. All batteries should be replaced
at the same time following the instructions of the supplier.
4.4 Contact the service center
If contact the service center for trouble shooting, please provide the
information as following:
1) Model name of product.
2) Serial number of product.
3) The date when the problem found.
4) LED display status.
5) Buzzer alarm status.
6) Mains power condition
7) Load type and capacity.
8) Environment temperature, ventilation status.
9) The information (battery capacity, quantity) of the external battery pack
if the UPS is long back up model.
10) Other information for complete description of the problem.