Now it's my time to join the battery swelling/warped blade club?

I have been using my razer blade 15 carefully since I bought it in 2018, generally, the model works fine for me since I am not a Mac fan,

However, for a long time, it couldn't be properly closed and I thought it was something about the magnet not what was inside. The touchpad was always not working as efficiently when I clicked, so I have always been using an extra rather atheris wireless mouse to support it...

What's really bothered me is that today I noticed that the side under the touchpad was warping outward, same thing happened on both sides on the left and right... By the way, the battery also runs out really fast if working without being plugged in.
I started to worry that if this going to get worse, will the warping or swelling affect the hardware of the laptop?

Through searching, I realised that it is a common problem for razer laptops,
What can I do, just order a battery and replace it? This is really sad there is no support or local verified store.
Is there any suggestion in this case? and what battery model should I buy for razer blade 15...