My 6S was affected by the faulty batch of batteries, and it was a miserable experience to have my phone shut down unexpectedly at 40% if I was using it outside

My 6S was affected by the faulty batch of batteries, and it was a miserable experience to have my phone shut down unexpectedly at 40% if I was using it outside in ~60F or colder weather. Apple replaced the battery once they admitted to the faulty batch, and my phone has been great since, but the way they handle battery issues is extremely frustrating. Going to an Apple Store and having them to their standard test, being told everything is fine and there's nothing they can do is not what I expect from them.