Why is my MacBook battery draining rapidly?

Question

macbook

Bought a Macbook Pro 2011. A year ago, the battery was changed in it, i.e. it is relatively fresh, mostly it works for me from the network, but when I turn off the charging, the indicators can drop sharply from 70% to 25%, and in general it lasts for an hour. Is it normal? Is there a warranty for replacing the battery, is it worth it or is this a problem of the norms for such an ancient device?

Answer 1

This problem is not normal, this is the worst Chinese battery. It makes sense to order a normal manufacturer on ali, change and forget.