In fact, I wager that you could find a spot on any phone model that you could hit with a narrow drillbit to disconnect the power. You could make a jig that you put the phone into and guides the drillbit into just the right spot.

It would only take seconds to use, but you would need to be prepared for the specific phone model.

Maybe you could even have a CNC machine preloaded with the data for a wide variety of phone models. You put the phone down on the work surface, key in the model, and the CNC machine deftly cuts through the right power lead. Less portable, but would require less precise planning.

I'm pretty sure you just made that up.

I'm a little confused here. Are you trying to say there's no way you can disconnect the battery of an iPhone even if you don't care whether or not it works when you're done? Really? I begin to doubt your fitness for this conversation.