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If it's just that one device (which is presumably low power) it would be several hours. I get 1 hour with 5 devices plugged in.
Sorry, there was a problem. Please try again later.If your modem is the only thing plugged in it will last a little bit pass 2 hours.
Sorry, there was a problem. Please try again later.Hello, This is dependent on the power draw of the modem. Please reference the below link for the runtime chart. https://www.cyberpowersystems.com/product/ups/pc-battery-backup/sx950u/
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