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Found some more info on them, from Global Defense Review.
The Before
http://www.global-defence.com/1997/BatteryFailure.html
The after/result
http://www.global-defence.com/1999/landsys/land6.htm
Yeah they are 12 volt, but for $20 each, you can buy 2 of them. I have no relation to the seller.
http://cgi.ebay.com/Solargizer-Battery-Maintenance-System_W0QQitemZ6006814050QQcategoryZ3240QQssPageNameZWDVWQQrdZ1QQcmdZViewItem