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9. Maintenance 
9.1 Operation 
The UPS system contains no user-serviceable parts. 
9.2 Storage 
If  the  batteries  are  stored  in  temperate  climatic  zones,  it  is 
recommended to recharge those batteries every three months for 1~2 
hours. It is highly suggested to shorten the recharging intervals in every 
two months at locations where subjects to high temperatures.