It does look a bit like the internal bit, inside an electro-magnetic door lock. I.e. The internal 2 wire coil assembly part...
No, there is nothing 'magnetic' like that, in the photo...
In digressing (as I'm apt to do! haha...), Mag-Locks always caused problems in a lot of systems!
They often have a 'built-in' alarm point sensor, and if the 'Mag' is de-energized, this causes an alarm, as if
the 'door' has been opened, even if it has not been opened. This sounds ok, but usually the system has
been programmed to cancel the remaining un-lock time after the door is physically pulled open. As a result,
they automatically re-lock about .5 sec after say an access card has been presented!! Argh!! 
Don't worry, as the thread responses occurred. I also concurred (poem), that it seems to be some sort of battery. On re-looking at the photograph, much more carefully. I can see, the individual cells (presumably), with the plates, insulators/separators and filling material(s).
Somehow, a long time ago, I saw (possibly regularly), what I think (but could be wrong), was a similar looking electro-magnetic lock, thing (although it was much smaller, and only had one element section). Which is why I posted that suggestion.
It is probably easier to see and examine these items in real life, and maybe make some simple electrical tests and possibly see if a magnet is attracted to the metal(s), etc etc. To more accurately and quickly determine what it is.
tl;dr
This thread changed my mind (I wasn't sure, anyway), it does seem to be some sort of battery.
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