Welcome to the Apple Support Communities.
First, take a look at Get help with your Mac notebook battery - Apple Support.
If the issue persists, get service at Apple. Get started by finding a nearby Apple Store, Apple Store - Find a Store - Apple, then schedule an appointment at the Genius Bar: Get Support.
If there is not an Apple Store near you, then see if an Apple Authorized Service Provider is: Get Support.
Only go to Apple or an Apple Authorized Service Provider for repairs. Do not go to a 3rd party or attempt a repair yourself. This is for the assurance of authorized and professional repairs that use genuine Apple parts. Please refer to this from Apple Support:
Beware of counterfeit parts
Some counterfeit and third party power adapters and batteries may not be designed properly and could result in safety issues. To ensure you receive a genuine Apple battery during a battery replacement, we recommend visiting an Apple Store or Apple Authorized Service Provider. If you need a replacement adapter to charge your Apple device, we recommend getting an Apple power adapter.
Also non-genuine replacement displays may have compromised visual quality and may fail to work correctly. Apple-certified screen repairs are performed by trusted experts who use genuine Apple parts.
Jack
