There are tools available to law enforcement that allow them to splice into a power cable and convert it to battery power while still online edit: i found it:

There are tools available to law enforcement that allow them to splice into a power cable and convert it to battery power while still online edit: i found it: http://www.cru-inc.com/products/wiebetech/hotplug_field_kit/ http://www.cru-inc.com/products/wiebetech/hotplug_field_kit/