Computer tinkerer since 1969…
not really a "novice" -)
Don’t confuse the 3.9 torx8 (green) with the 3.8 torx8 (blue): the green one has a tapped hole for one of the two torx3 of step 29.
Unsticking the packs is messy and dangerous since they may tear if too much force is applied, especially if swollen.
But do they need to be glued in?
The batteries should not move: in time that would damage the connections. Measuring carefully, the space between the unibody and its lower case is 8.2mm. The thinnest packs are 7.0mm: there is some room.
Instead of taking the protective sheets off the glue patches, I put bits of double-sided tape on top. The batteries are now easier to remove, but they cannot slide around.
However, after turning the machine upside up, they are in fact “hanging” from the “ceiling”! My office tape solution works, but the thinner packs might in time unstick and fall down.
It may be advisable to use the strong glue anyway, or else put some thermally conductive silicone sponge between them and the lower case.
The batteries are under the palms of your hands: they don’t get warm, leaving the protective sheets on should not have any effect. The unibody case there is 0.8mm thick.
Once one of the packs is loose, stick a leaf of toilet paper under it, so that it cannot stick to the body again, while you are working on the other packs.
The bottle may (will!) squirt liquid. I used a bit of absorbant paper around the tip while turning the bottle upside down and putting the tip where it needs to go. Be especially careful not to drip liquid onto the speakers.
For this type of work I always have a roll of thick toilet paper nearby: its leaves are smaller than those of kitchen paper.
Very nice guide! Two points though:
In step 46, the T-8 Torx 3.9mm screw in the top left corner of the logic board is indeed different from the T8 in the right hand corner, because it has a hole for the top screw of step 29! (I’ve never seen a more schizophrenic assembly, but that’s Apple)
The views of the machine are sometimes taken from opposite angles, be careful to observe where to look. This is a general point which should be taken into account fore future guides.
Despite all that, the report is that the battery does not charge. I did the procedure a second time (without battery removal of course) but to no avail. Anyone any suggestions?