Genuine 77.5WH Battery for Apple Macbook Pro 15" i7 Unibody MC723G/A A1382
Original replacement battery, for 15" i5 & i7 Macbook Pro from 2011.  Note: when installing, be sure to reset your system's SMC immediately, as it may continue to register errors from your old battery.  You can find information from Apple's website, or Wegener Media offers technical instructions for this process in their documentation with the battery.