From PS Magazine, Dec 2007:
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If you find the recommended DAGR external power cable NSN 6150-01-521-6755 is out-of-stock, you can still safely get vehicle power to your DAGR using the converter. Use the DAGR cigarette lighter, NSN 6150-01-521-2548, (which is in-stock), to connect your DAGR to the converter for 12V of fuse-protected power! Same solution works for PLGR with the cigarette lighter cable 6150-01-450-9262. You can get it from Rockwell Collins using CAGE 13499 and PN 988-2163-001.
For more info on portable power systems, check
http://eommandanflcontrol.monmouth.army. mil/army_power.htm
nd for alternatives to provide external power to DAGR, check Army PM GPS at
https://gps.army.mil