Field intensity is exponentially related to frequency and level. Line freq is too low to radiate all that far and JD said it was a low voltage (100's of volts) line so it wouldn't be electrostatics, would have to be current induced inductive coupling, aka electromagnetics.
V (induced, volts) = L (Inductance in Henries) di/dt (rate of change of current influx/period of change, in amp-seconds. Course since the plates are adjacent, the average value of ac electromagnetic coupling attempting to excite the plates and induce a charge change (aka deplete the charge on the cells) is zero so there would be a zero chance of inductive pickup with the plates as I see it. Assuming that coupling was occurring, one half cycle would discharge the plates to a degree and the other half cycle, opposite in phase would charge them back up....net effect = zero change.
I can dig out my McGraw Hill EE handbook and get the field intensity equation but I think it would be a waste of time. Little to no inductance in a thin, flat, plate.....no L no energy transfer, Wl being ½ L I (exp.2) and no L on a flat plate and average value of I is 0.
Tossing my hat on answering the concrete thing, you aren't going to discharge 12v in solution through a heavy duty rubber or plastic housing unless it's impregnated with something like lead that has fair conductivity along with the poor concrete conductivity. I was fed that same wives tale when I was young also. I think the tale is more oriented around sulphate doing the dirty work, piling up on the bottom of the case and shorting out the plates. Gotta have a mechanism for something to happen. I don't see one here.
My brain just slapped me with this: Steel battery trays are much higher conductivity than concrete. If leakage through the case were the culprit and there was a mechanism in that concrete shorted out the cells through the case, tell me why you can take the same battery and put it in a vehicle on a steel shelf, painted, rusted, or not and it not discharge?
That's the way I see it. Been away from stuff like this since 2005. Things have gotten a tad rusty.
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