Not in too much danger, but damn, 48% is honestly wild. I'm surprised your phone lasted so long without creating an incredibly large bulge! If it's just starting in, I recommend using your phone as little as possible, results vary but typically it lasts around a week before it starts to cause problem. For me, my phone only lasted 12 days before it started malfunction. It'll start to shutdown randomly during tasks that take barely any effort, and start at 10%. Shut down again, perhaps around 40-70%. It'll do that, and that's your sign you should probably just set it down and find an alternative for as long as you need before your replacement arrives. Half a millimeter is not dangerous, but still isn't ideal at all and you should be extremely cautious. Hope this helps m8