I have been spending some time studying the effects of EMP (Electromagnetic pulse) and now I am more confused than ever. There are so many conflicting theories that I have come to the conclusion that I will prepare for the worst case and hope they are wrong.
I am basically putting one of anything I want to be sure and save in a Faraday bag. This is a mil spec bag that I get from Tect Protect. See More on EMP Protection
The items that I place inside the bag are either wrapped in plastic and then aluminum foil or placed is a metal can with no opening. Items in the can are insulated from the sides of the can.
Among the items you protect include LED flashlights. An LED is a diode (Light Emitting Diode) and as such is a silicone-based semiconductor. This may be destroyed by EMP. There are some differences of opinion on this. As I said, I am going with the worst-case version. Along with the flashlight, I am including some Eneloop rechargeable batteries and a Powerfilm solar charger. This will give me the ability to keep a flashlight functioning for several years.
The reason I included the batteries in the Faraday cage is that I have been told by a good informed source that there is a question about the effects of EMP on NiMh/NiCd/LiIon batteries. So again, I am playing safe.
So again, my rule is if you want to be sure it will survive a EMP attack, put it in a Faraday Cage.