Another Swollen battery

I've seen a lot of people have swollen battery issues. Mine just started. I bought my Razer Blade 15 in March of 2019 so it's out of warranty now. They won't allow me to open a ticket because it's out of warranty. I have a few questions: Where can I get a replacement battery? Why is this happening to everyone? Why do my Razer laptops always break about 6 months after the warranty expires (my 14" had melted cables almost exactly 6 months after warranty expired as well).