The MacBook Pro 2012 can be equipped with larger SSDs and batteries
SSD to SATA Adapter For MacBook Air Pro A1398 A1425 A1465 A1466 (Mid 2012,Late 2012)
2012 MACBOOK Air PRO ssd to SATA Adapter+USB cable [PA5025G+5031] - $17.99 : Sintech Eshop!, The World of PC Adapter Card
MacBook Pro Mid-2012 SSD Upgrade: Reviews & Install Guide
The next-gen MacBook Pro with Retina Display: SSD Analysis
SSD (7+17pin) to SATA 6.0Gbps Card converted into 3.5/2.5 inch SATA interface(22 pins) for Apple MacBook Pro 2012 Retina A1425 A1398 & Apple MacBook Air 2012 A1465 / A1466 / A1435 / A1436 - WIT Computers