I recommend to skip step 14 ( pry the left speaker cable connector up off from its socket on the logic board). The risk of damaging the socket is very high. There is even a warning in this guide (Be sure you are prying up on the connector, not the socket itself!).
Proceed from 13 to 15 and 16 to remove the right speaker. Still with the connector in place you can put the speaker a bit aside and have enough room to remove the battery packs in the steps later.
Same for left speaker and its connector cable (step 18).
Hint by @roelofk with old credit card is very helpful.
Excellent description and excellent pictures. Thx