I used a hair dryer to soften the adhesive.

OK, you still leave a very small, microscopic, layer of adhesive after removing the black tape, but really, new tape will still stick to that. We’re not trying to make the iPad water proof - we’re simply trying to make the components secure and not fall apart. Shame Apple couldn’t have used screws instead!

I did too, you get far more control and no expense on fancy equipment.

Hair dryer works just as well. Approx 3 or so minutes oh high.

See my comment in Step 51

See my comment in Step 51

See my comment in Step 51

See my comment in Step 51

Yes this is a bit of a pain, but I did succeed after about 5 minutes.

I used a standard out of date credit card or equivalent, which is strong and costs nothing.

Working from the edge nearest the case, as shown above, I managed to get about 1 cm lifted, then apply hairdryer in that gap, directly between battery and case, followed by some brute force with the card to keep sliding, wiggling and prying. Eventually one of the cells is lifted out of the way. More heat with hairdryer on back side of case, then as before slide the credit card hard under the battery, wiggling, eventually getting the whole battery out without damage.

It’s quite stiff, the board is secured by adhesive, so don’t worry about using gentle force.

Continue to pry off the flexicables, also secured with adhesive.

The wider end allows better leverage and no slippage