i received an email from the after sales support and they said i should contact the site i bought it from (in that case gearbest) so that i can get a full laptop replacement.
It would be completely careless naive and dangerous on my behalf sending a faulty battery all the way back to China via airmail especially when it shows signs of overheating, although it would be convenient for me to get a new laptop back.
I could try to fix it on my own if i had the replacement parts and i wouldn’t mindind losing the warranty.