Sennheiser Momentum Wireless M2 AEBT Battery Replacement

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Pull the earmuff near the top until the seam starts to pull from the split in the headphone case. Continue until the earmuff fully separates from the headphones as shown.

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Using a sharp knife, carefully remove the clear plastic stickers covering the screw holes, and save them for later. Use the #0 Philips screwdriver to unscrew the four 8mm long screws.
Grab the cover and carefully pull off to view inside of headphone.
NOTE! There is a small wire from the mainboard to the outer shell which remains attached to the headband. This is the NFC pairing wire and if broken the NFC functionality will be lost.

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Take note of the path the wires are place into from the battery to the terminal on the main board.
Use a spudger or finger nails to carefully pry out the battery connector (and wires) from the terminal on the main board. Once removed this will disconnect the wires connected to battery.
NOTE! There is a very fine wire which crosses over the battery and you must be careful to not break this wire, so the battery has to be lifted out from the top.
Working from the opposite end of the battery wires, carefully pry the battery off from its light adhesive.