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Not that it matters (since none of these "security" measures pass anything even close to a cost-benefit analysis anyway), but you could imagine that phones or laptops would make particularly good bomb hiding places for a certain kind of bomb, because they're already packed with electronics, so it would be easy enough to replace the battery with plastic explosives and hide a detonator among the rest of the electronics there.

Of course, as people have pointed out, you could rig the battery itself to explode, or if you just need to turn the thing on, you could replace 95% of the battery with explosives and just leave enough power to turn it on and off. Like I said, it doesn't make any real sense, but there's a superficial argument for doing it this way.