I had a Samsung Galaxy S4 with the dock with Micro-USB for the phone and behind that a slot for a user-replaceable battery. It took 2 seconds to pop the back,

I had a Samsung Galaxy S4 with the dock with Micro-USB for the phone and behind that a slot for a user-replaceable battery. It took 2 seconds to pop the back, 1 second to remove the battery, 1 for the new one, and 2 seconds to click the back back on. All around a battery swap took 1 minute which included phone booting. Oh and that S4 was waterproof.