I agree that something wrong happened. Im just telling you that batteries die and its a natural process. They should of had some sort of battery health indicator that said battery is dying, time to replace but they would've got a class action launched for that as well saying it's too early and they are trying to increase battery sales. Batteries should last longer than Apple is quoting etc.
When you're on the top, people want to take you down no matter what.
Nope it is not a natural process for my phone to reboot or shut down at 50% after One year 6 months. I went in for a test and they told me the battery needed to be changed. Sorry out of warranty you must pay. Mind you I have a laptop with a battery that never been changed it is 7 years old. So no battery is not supposed to be changed after 1 year and 6 months. I expect this or any rechargeable battery to last 10 to 20 years otherwise it is defective. I have rechargeable battery that I use for a flash in photography. Double AA. I got them in 2005. Constant use and they still hold charge for 400 pictures average per job. They still go to 100% not quit at 50%. 2005 is 13 years old.