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For components where the plug sticks out a bit you can just pull them out with your fingers. Only pull on the hard plastic bit, not the wire. The internal battery falls into this category.
On components where the plug is more recessed, careful use of needle nose pliers will do the job, though you may mar the plastic slightly.
TL-EW02 is the official tool on an 11 speed group if you want to avoid the above. TL-EW300 is 12-speed only.
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Thanks @gbj_tester and @grams
Much obliged.
Never thought there could be a wiring tool.
Mine is the (old) Ultegra 22-sp (rim brakes).
I need to remove the Di2 groupset from my bike.
Is there a recommended way to do it?
I'm most concerned about the battery hidden in the seat tube.
Need any special tool(s)? (I have quite a lot already)