PowerWalker VFI 6000LE Plus - Manual (Page 32)

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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:
Model name of product.
Serial number of product.
The date when the problem found.
LED display status.
Buzzer alarm status.
Mains power condition
Load type and capacity.
Environment temperature, ventilation status.
The information (battery capacity, quantity) of the external battery
pack if the UPS is long back up model.
Other information for complete description of the problem.