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- Most UPS Batteries are 12v
7ah I believe.- The Shack is about the most expensive place to get the Universal Power Adapter , but does give you the ability to custom tip them for many devices. I have one laying around but if i remember they are very large. I have a 12v 1500Ah, the correct size it cost me $20 BUT I got 1 tip for free (a normal RadShack thing). Note: it is HUGE in physical dimension. - Many 3.5" External USB Harddrives use 12v 1.5a power supplies and they are usually much smaller. Make Sure the tip fits correctly and has the correct polatiry. thats my $0.02
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