“Is there a backup battery that can be used with this modem (and if so, which one) or should one use a UPS?”

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• No. Wished that there was a battery slot. Need UPS.

  Answered by TexasBuyer 5 years ago

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• No backup battery- I just use a UPS.

  Answered by Empennage 5 years ago

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• CM2050V doesn't support battery backup, but you can use any UPS for the power failover. You can find the instruction below on Netgear site. https://kb.netgear.com/000048418/How-do-I-install-the-uninterrupted-power-supply-in-my-CM500V-cable-modem

  Answered by max911turbo 5 years ago

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