Battery health of Macbook Pro declining rapidly
I have the MacBook Pro and have found through CoconutBattery that my design capacity (battery health) is at 83%!! I bought it in 2020 September, and it's only been 7 months and 150 cycles... this is so frustrating because all the Apple Support staff said they couldn't do anything since the Apple website states that 1000 cycles should retain 80%, but I feel like my battery is defected. Any ideas on how I can get my battery changed (hopefully at a lower price, because I'm on limited warranty)?
MacBook Pro 13″, macOS 11.2