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There's usually a bit of a trick sliding a screwdriver into a slot which you can't really see because of the angle until you've torn the whole thing off the ceiling when it becomes very easy to see what you should of done in the beginning.
The mains supply shouldn't be accessible if all you've done is remove the user serviceable cover to reach the battery.
Airhead
Fortunately I know there aren't any discarded ones around. The only room where that was a possibility I ruled out during last night's wander round the house listening.
Looking like it is probably the battery backup then. Obviously the most likely candidate is the one over the stairs that is awkward to get to. I assume I should turn off the power to them before fiddling.