Some models of MacBook Pro (Retina, 15-inch, Mid 2015) are eligible for a free battery replacement due to a safety recall recently introduced by Apple. Lapin can provide service for these units under the recall program as specified on Apple’s site here:

As noted in the support article, we recommend creating a current backup of your data before the service is completed. Due to government safety regulations related to lithium batteries, the recall/repair service can take 1-2 weeks to complete due to ground shipping requirements.

If you are not sure if your Mid 2015 (Non-Touchbar) 15″ MacBook Pro is eligible for this program, you can enter your serial number at the link above to see if your unit is within the recall window.