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My cable modem has a battery back-up that lasts 2 hours.How can I best extend that (for telephone operation)?

I have a portable ‘12 v. jumper pack-portable’ with a cigarette style power tap. Would it be most efficient to utilize a step down transformer that taps into the back-up battery connections vs. a 12v. d.c. to 120v. a.c. adapter?

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This entry was posted on Wednesday, September 1st, 2010 at 6:46 pm and is filed under Battery Backups. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.

2 Responses to “My cable modem has a battery back-up that lasts 2 hours.How can I best extend that (for telephone operation)?”

  1. Get a UPS (uninterpretable power supply), plug the cable modem into it.

    You can buy one at Best Buy for ~$50.00

    I’ve got a UPS on every computer in my house.

  2. Your best bet is to get a UPS (uninterruptible power supply). The more money you spend, the longer backup you can get.