These are typically part of an AT&T U-Verse system and allow the telephone to work when there's a local power failure.
Here is a Belkin web page showing this unit: Sku BU3DC001-12V
I may have a number of applications for these:
DSL modem
VOIP hardware
Panasonic KX T824 telephone system
Reading light on bed headboard
more.....
This is a 12 Volt 7.2 Amp Hour Gel Cell battery in a case that includes a charger with float capability and also has system monitoring functions including a warning alarm. It amounts to an uninterruptible 12 Volt power supply.
Supposed to supply enough power to support one phone and U-Verse telephone only service for 4 hours of power failure.
Battery
The BC7-12 by B.B. Battery has a listed size of 151mm (5.94") x 65mm (2.56") x 94mm (3.94") The measurements (Fig 5 below) are slightly smaller.
The Power Sonic PS-1270-F2 (data sheet) might be a good replacement. Note they supply discharge curves for various conditions.
7656120 Power supply system comprising rechargeable battery pack and attachment apparatus, Thorben Neu John, Wadsworth Ian Sinclair Jeff Meyers Oliver Duncan Seil Barry P. Sween , Belkin International Inc, 2006-03-15 - for MP3 device, but may contain common features.
7397654 Uninterruptible power supply and method of manufacturing same, Kenneth Mori, 2008-07-08 -
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