Completed and I still have a working laptop, Many thanks for the guide.

See inline comments above for issues I faced as it took me 40 minutes to complete - but I was being very careful.

Study the connector on the new battery carefully and the large photos in this guide so you know which bit to push in which direction. The connector was in very firmly so you have to apply reasonable force very carefully as you must avoid slipping and damaging the motherboard components. I had to try a few different techniques as pushing just the small black plastic rectangle as shown was doing nothing. I found grabbing the sides of the cable with my fingers and wiggling side to side a little helped.

The most difficult part of this for me was inserting the new battery cable. This will depend on who manufactured the replacement. It was very stiff and I used a spudger on either side of the connector bit by bit - i.e. push the left side in a bit, then the right side, and repeat until it was fully in. Again, be careful not to gouge the motherboard and don’t cut into the outer cable in the connector.

The cable was a bit too long on my replacement and curved upwards proud of the battery. I was hoping that pushing down best I could and reassembling would not cause a problem but now the right mouse click on the mouse pad is very stiff and only just works. I think I’ll live with it rather than open up again as I’m just happy that the laptop still works and has a battery that has a decent life.

One of the screws was stripped on my laptop (the one between the fans) and rotated without releasing. I had to remove the other 7 and the battery cable and carefully lift up the battery while undoing the screw to try to pull it out. Thinking about it afterwards, maybe the location in the base that is was screwed into had snapped away rather than the thread being stripped which was why extracting was so problematic.

I have a different cable on my XPS 15 2 in 1. The fan covers were not attached to the cable and remained in place. So only the long thin strip was removed and it came of very easily

I found it quite tough to make the initial pick insertion. The easiest point for me was on the rear edge of the laptop just to the outside of the hinge.

The screws were all same size so no need to remember which came from where.