Well it depends on the amount of wire inside the device, I think.
Please, think why. Battery is faraday cage. There is no induction inside battery.
Lead batteries have liquid electrolyte, so cannot be damaged with short overvoltage
As far as I understand EMP, it will induce voltage/current depending on the length of items. This means that the mains grid will get VERY high voltages and basically fry anything connected to it, but small unconnected electronic stuff will only have small voltages/current induced. This might be able to damage some sensitive chips.
Many flashlights are build as Faraday cages and will be protected, even if they have some sensitive chips inside.
Correct.
And all metal flashlights with metal reflector are 100% shilded from EMP.
Problem is only with long wires and unshilded electronic with large PCBs(long connections)
Reminds me a case of heavy solarstorm back in ’80s (?) in North America or Canada (or both).
If I remember correctly, lights went first out, then they were blinking or getting a bit brighter and dimmer because of the voltage generated by the storm…
Guys!
Do you really think that the LED will survive? If the electronics are protected because they are inside a “pseudo-faraday case”, the led is not inside, it is “exposed” ….
There is only a few mm to pickup energy, that will not give many volts.
At the end it all depends on the strength of the EMP, doesn’t it? Nevertheless, we are talking about thousands of amps, so who can be certain that such amount of inductive current will affect very small circuits or not… It is also said that something grounded will also be somewhat less prone to EMP (unplugged of course), but… better safe than sorry. For me the first theory that holds true is to use a Faraday cage (metallic/mesh enclosure), and the second one which seems reliable is that flashlights are like a Faraday cage… anything else is speculation, we will find out if such an event ever happens…
hmm……
Is a good way to see what will happen if an EMP occurs, putting a flashlight and a battery inside a microwave at full power? Or the EMP burst will be more powerfull than the microwave? Or different wavelenght…?
Some months ago, I put a working flashlight (switched on) with a NiMh battery inside a microwave and microwaved it during 1 minute.
Nothing happended. Only a few sparks… but both the flashlight and the battery never stopped working while the process.
Also today, it is still working
I'm not sure but I'm going to guess they arent the same.
Holy Cow 
Cheers
No need to wrap them… just keep them under your tin foil hat.
Solar storms/EMP do their evil to power grids by inducing a DC bias voltage onto the AC power grid. That causes the magnetics in the transformers to saturate and stop working properly. If they don’t physically fry, they return to normal after the event.
You remember all that FCC class A and B conducted/radiated emissions requirements for electronics devices? Turns out that the shielding and filtering required for FCC compliance goes a long way to mitigating the effects of casual EMP effects. Anything more than that, and well, you have more to worry about than some blown electronics… until your digestive system sloughs off and you croak.
Very good reading:
Fun bedtime reading is Glasstone’s classic “The Effects of Nuclear Weapons” Get the later edition, make sure it comes with the cool circular slide rule effects calculators.
Also:Philip J. Dolan, editor, Capabilities of Nuclear Weapons
LOL, that’s why I love BLF and come here, a hand full of good humor and wild discussions about EMPs!