Backup for Modem


I need to build a Battery powered backup for my ADSL Router so I could use it when the power goes out.

I need some assistance regarding the equipment, How-to's -

what kind of rechargeable battery, voltage satbilizers do I need to build this setup?

Here are the details found on my modem's AC-DC adapter.

9.5v - 8500mA

Waiting for helpful reply :)

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