iFixIt said the batteries are too well glued to upper frame for removal. [image from iFixIt] Made me think if replacement batteries come installed in the entire upper frame as a finished unit and simply transfer the RMBP guts from old to new unit. Would make for a fast and easy replacement of batter, making the upper frame essentially the battery box. Would be cheaper too with no time spent ripping batteries out and sticking in new ones in (making sure not to rip out the track pad). Naturally, it will increase the mass of the discarded "battery unit". On the flip side, unlikely to find 3ed party battery units, so do you feel brave enough to replace the batteries?