Submitted by Patrick

PLEASE: If you are in the military, let go of the SDU-5/E and get a Firefly Two (NSN 6230-01-448-8340 w/pouch; 6230-01-411-8535 w/o). Keeping the SDU-5/E going is creating a problem in acquiring the replacement BA-5374/U battery, which has no other use. The cost to DoD for acquiring this specialty battery is very high and will continue to rise.

ED – Patrick.  I agree, finding replacement batteries for the SDU-5/E is getting harder and more expensive, for both civilian and military alike.  If you’re going to continue using the 5/E my recommendation is you go to an outfit like PRC68 and get an adapter cap which will allow you to run the strobe with a pair of CR123 batteries.

Baring that, you ought to upgrade to a strobe that runs off of AAs or CR123, of which there are many on the market.  The ARC Firefly2 (I think I found the proper civilian reference) you suggest is a white light only strobe.  While this makes it a fine piece of kit for civilian search and rescue operations, it lacks a IR filter for use in tactical situations (which is why I’m a big fan of the ARC MS-2000(M).)  Do the Gov. issue ones you mention come with an IR filter?

Check out the ARC Firefly2 here.

{ 6 comments… read them below or add one }

Class 55 USASMA July 31, 2009 at 4:37 pm

Try this link:Grunt Gear has them ready to go.


scottfmurphy August 3, 2009 at 3:02 am

I just wanted to drop in and say – does ACR make anything that doesn't rock?

They make an awesome array of PLB's and a ton of other survival gear. Their stuff holds up really well.

Checkout the ACR site here:


Terry August 12, 2009 at 3:18 am

here is replacement cap free shipping too


Terry August 12, 2009 at 3:19 am

here is a great cap free shipping too


Terry August 12, 2009 at 7:19 am

here is a great cap free shipping too


John J June 14, 2011 at 8:17 am

Try procuring military version of MS-2000 with or without pouch directly from government contracted maufacturer; Fedcap, 119 W 19th St, New York, NY 10011. 212-727-4359


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