These instructions are brilliantly concise! Thank you. And thank you everyone for your comments. As a final comment from me, it is much easier to assess the final position of the batteries if you place them gently in position, reinstall the speakers, adjust the battery position if needed and then press them firmly into place.
If I were to do this again, I think I would leave unbolting the transverse battery until after ungluing the other four. That way one can tip the laptop on to one of its short sides and so run adhesive remover along the long edge of each battery and let gravity assist penetration without the transverse battery falling out.