I agree with Dave la Rose, provided you use heat rather than solvent to remove the old battery (or possibly floss, haven’t done that). Please see my comment further down this thread on how to use an iOpener for correctly heating the glue joint

I really don’t understand why it is suggested to heat this side of the battery! I used an iOpener on the aluminium case, on the side the battery is actually glued to. You have to open the screen and place the laptop upside down on the edge of a table with the screen hanging down over the edge. This way the heat gets directly to the glued joint between the case and the battery. Worked a treat no solvent needed

I have one of these macs with a dying battery. Two years ago I removed the glued in battery of a 13” macbook pro 2013/2014? without using solvent at all but instead using one of ifixit’s microwave heated heat bags applied to the keyboard side of the bottom case. Worked absolutely fine. I am also wondering if the motherboard removal is really necessary except as a precaution against solvent damage? So no solvent no need to remove? It would be useful to have ifixit’s ‘official’ view on this, there may be other reasons I am not aware of. The other concern is that in the case of the 13” the new battery began to fail after about 18 months so the repair was of rather marginal quality.

IsidoreM

Was going to post the same comment- absolutely agree that you should protect the device from conducting dust- could easily get lodged between IC pins, especially as magentised through grinding and would stick together in a sort of string.

That looks like a teflon coated baking sheet? I would not recommend using a green (coarse ) scotchbrite pad on a teflon coated surface as you will damage the coating!

Yes a proper dual sim would really reduce the aggro from providers. One thing has always bothered me about these glued shut phones: What happens to the waterproofing once you have opened one using an iopener or similar soource of heat? When reassembled, will they still be waterproof? (almost certainly not?)Could you remove the old sealant and rewaterproof it properly? What would you use?