I had an mid-2015 which battery did swollen after 8 months of usage. It bulged the trackpad towards the screen and making a dent. Apple does count that as part

I had an mid-2015 which battery did swollen after 8 months of usage. It bulged the trackpad towards the screen and making a dent. Apple does count that as part of in-warranty repair though. A very expansive battery repair for Apple. By the way, their repair would take longer than an entire week, which is worse than most laptops vendors.