Many good branded UPS dont need to be switched on for battery charging. All you need is to keep the mains to the UPS on.
Also if you dont have any power cut for a whole month then its better that u run the system in UPS's battery mode to drain the battery (not fully just 75%) and recharge it. This will recycle the battery and keep it in good condition.
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Kannan.
Binary Bits
http://www.binarybits.net
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