PowerWalker VFI 1000T LCD - Manual (Page 34)

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9. Maintenance
9.1 Operation
The UPS system contains no user-serviceable parts. If the battery
service life (3~5 years at 25°C ambient temperature) has been
exceeded, the batteries must be replaced. In this case please contact
your dealer.
9.2 Storage
If the batteries are stored in temperate climatic zones, they should be
charged every three months for 1~2 hours. You should shorten the
charging intervals to two months at locations subject to high
temperatures.
9.3 Battery Replace
If the battery service life has been exceeded, the batteries must be
replaced.
Battery replacement should be performed only by qualified
personnel.
It recommends to shut off the UPS completely before the replacement.
If there is a battery breaker then turn it off first. Disconnect the battery
cable carefully and make sure no any exposed wires can be touched.
Reconnect the new batteries to the UPS by following section 5.8.
Then turn on the battery breaker and press the ON switch to make the
UPS do the battery test, check whether the battery information is
normal.