Battery issue with MacBook Pro 13 inch (Early 2011)

The built-in battery of your MacBook, MacBook Pro or MacBook Air is designed to deliver up to 1000 full charge and discharge cycles before it reaches 80 percent of its original capacity. Link.

Little differences in capacity are normal and are no indicator for a defect battery. Only contact Apple when your battery performes worse than the design capacity.

It's probably a calibration issue. The easiest way to recalibrate is to leave the MacBook on until it sleeps because of low battery. Leave it off for an hour and then recharge fully (no interruptions and use OSX). Use CoconutBattery or similar tool to monitor and log your battery status. My prediction is that it'll update the health to at least 98%.