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Thank you for your inquiry. I am sorry to hear that you are having problems with our unit. it could be the battery but generally when they fail the replace battery light will light on them. The internal batteries last around 3 to 5 years so it may be at it's end of its life. If it isn't the battery it could be there is power issues in the night because the clicking can mean that the UPS is going on and off battery. If you need further assistance I recommend reaching out to an APCbySchneider support team. We offer email and chat services through our support site. For the fastest service visit our chat at https://www.apc.com/us/en/tools/chat/.
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