-12-7. MAINTENANCE - EP700/1000/2000/30007.1 OperationThe UPS system contains no user-serviceable parts. If the battery service life (3 - 5years at 25°C ambient temperature) has been exceeded, the batteries must bereplaced. In this case please contact seller.7.2 StorageIf the batteries are stored in temperate 20°C~25°C, they should be charged every threemonths for 1-2 hours. You should shorten the charging intervals to two months atlocations subject to high temperatures.