Applecare and battery

If the battery is defective, and you have AppleCare, then Apple will replace it for free.

However, a battery is considered a "consumable" item, meaning a depleted battery will not be replaced for free. If the battery is depleted, you will need to buy a new one. Similar to buying batteries for a remote or a car, it will eventually die and need to be replaced.

You will have to take it to an Apple Store to have them determine if the battery is defective or just depleted.

Use THIS article to determine your battery's cycle count. If it is above the cycle count in the article, then it is depleted. If it is far below the cycle count listed, then it may be defective.

Best of luck

(Heads up, you said you bought the computer in 2014 but your profile says it is from 2012. If it's from 2012 your AppleCare will have already expired.)

I would take it in for a battery diagnostic then. What is your Full Charge Capacity? What is the condition that it shows?

That capacity looks pretty normal, but only Apple has the precise information on what is considered a "normal" capacity.

Do you have a lot of background apps running such as Chrome or backup software that could be draining the battery? Things like Google Drive constantly refresh. Anything that constant refreshes to keep things "live" will kill your battery faster. For example, Google Docs, Sheets, and Hangout are always refreshing.

May be worth a trip to the Apple Store if you aren't too far from one.

Glad I could help out