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a late response, but you can use a very simple and cheap "UPS" for Router, modem, swtich, cctv, alarm, led light. etc. and last much longer without the lost in conversion DC to 120v AC(router adapter) to 12v DC (router adapter) again, https://www.aliexpress.com/item/12V-15A-180W-DC-po...or another special for router-modem with a 18650 lithium battery inside (interchangable) in a wallwart format :https://www.aliexpress.com/item/5V2A-AC-to-DC-Mini... this units supply 12v direct. have a nice day!