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6. Maintenance
6.1 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 exchanged. In this case
please contact your dealer.
6.2 Storage
If the batteries are to be stored in temperate climatic zones, they
should be charged every three months for 1-2 hours (see Chapter
"Installation and Start Up"). You should shorten the charging intervals
to two months at locations subject to high temperatures.