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I am going to buy a Line Interactive UPS (around 600VA/360W with one 12V/7AH Lead Acid battery - probably PowerWalker VI 650 LCD, or Cyberpower Value 600ELCD, or any other...) for my PC needs, and will install this on my countryside house, where I go every 2 or 3 months. My PC (with monitor) power consumption is 200-250 Watts.

Every time I leave my home, the PC will be turned off for around 2-3 months until next time. During this time my PC will be disconnected from the UPS.

My main question is: In order to maintain the UPS battery (Lead Acid) in good shape, should I leave my UPS connected to the mains power? If yes, should I also leave the UPS power button ON, or turn it OFF?

How long (on average) a 12V/7AH battery for the above mentioned UPS will last before a replacement is needed?

PS1: One additional question is, can I use a power strip before the UPS (between mains and UPS power input). Although I am mainly interested for this, how about a power strip after the UPS (between UPS output and connected devices)? If NO is the answer, please elaborate why.

PS2: What is a "calibration of UPS battery sensor" and how this is done? I read somewhere as a tip for UPS Lead Acid batteries maintenance, that "you need to recalibrate your UPS battery sensor every six months"

Thanks in advance!

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Just so we're clear. This isn't you asking us what model to buy, it's you asking how to properly maintain your UPS device. –  Doktoro Reichard Sep 21 '13 at 22:09
    
@ Doktoro: Exactly, and in specific how to maintain the battery in good shape according to the above situation. –  John Bubu Sep 22 '13 at 0:57

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