well I don't know..those ghost shows are always talking about emi and how it's everywhere and affects their devices and stuff..an emp would be a lot harder to find and you would probably notice it going off lol
Just looked it up. That is radio interference it would mess with radios and possibly the gps. (Not quite sure) You wouldn't necessarily feel an emp because there are solar storms everyday and there may have been a strong one that day.
Just checked the lights with new batteries and they all work fine. Popped all the other batteries int he charger (sysmax I4 V2) and they all are charging and showing 1 bar out of 3. Piecing it all together, no lost time, butt not hurting, protection circuit kicking in, must be self discharged batteries and not aliens. The 4sevens acted as if it was too hot, but it was the only that switched back on from going off on its own.
I guess the lesson here is beware of self discharged batteries. They were charged no longer than 10 days ago, do they really discharge that quick?
I have the i4 v2 to and what I discovered is when it says full (all three lights) it is not done yet. I measured one and it was at 4.02 when it said full. It continued charging but it can confuse you.
Hard to say for sure without some firm data to go on. You need a multi-meter to really decipher whats going on. A DMM will be able to tell you if your charger is under-charging them, and if the cells really are discharged after a dormant ~10 days. 10 days does sound REALLY short though. I have laptop harvest Sanyo and Panasonics that will last for at least 2-3 months (thats the longest I have cared to LSD test them) at or above 4.15V.
Are they protected cells? I have one or two lights that will "kick" the protection feature on, I think because they pull to much in amperage. Has nothing to do with being low on charge.
An EMP (Electro Magnetic Pulse) would generate EMI (Electro Magnetic Interference). The difference would be that a pulse by definition is a very short term, high energy event. Interference is a more general term for trouble being caused by induction.