Chosen Solution
The MBP Retina teardown uses brute force on the battery. Have you tried applying heat? I would apply a heat-shrink style heat gun to the metal opposite whatever is stuck, right at the location where I’m prying. Do not directly heat the battery. I haven’t got an MBP Retina, but I’ve noticed the adhesives used in the old MBP respond to heat very well. FWIW. Try this before solvent, which was suggested in another query. (Then try Goo-Gone, if you can avoid contaminating other components.)
I would be very cautious suggesting the use of heat on these batteries, you risk fire. explosion, noxious fumes serious personal/property injury!! Apple’s technicians have been told that the battery is not a replaceable part. their solution is to replace the top case assembly, to which the battery is fixed. IMnsHO encouraging a DIY to attempt this proces would be on the order of encouraging an amateur to work on a CRT–irresponsible and unprofessional.
Try this http://www.instructables.com/id/Easily-R…
Just did a trackpad on a 2012. The battery glue was a nightmare. I used alcohol. It disolved the glue pretty quick. Still you need to take time and patience to do it so it doesn’t tear or break anything else.
Best kept secret and works like a charm! I use good ole WD-40 poured into a syringe with a plastic tip. DON’T USE A METAL one to avoid puncturing the battery. Run a line the liquid near the longest edge and orient the battery so that gravity can move it under the battery. From the other side apply some heat just until it feels hot to the touch. The aluminum will dissipate the heat through the glue and help wick the WD-40. Keep running WD-40 until it stops wicking with some more heat if it cooled of. Wait for about 5 minutes, give it some more heat. You can now start the battery detachment procedure. The battery should come off very easily with little pressure. If you feel any resistance, run some more WD-40. When removed, make sure you clean up all residual WD-40 with acetone or alcohol from all areas. WD-40 is a lubricant and a tiny bit of it should hurt anything, but it will prevent any adhesion.
