To replace the original battery in Classic Connect:
Cut the two wires going to the original battery and remove it from the shell. Cut them one by one if you are not using a pair of non-conductive scissors.
Insert the cable from the new 2000mAh battery into the A port on the top circuit board of Classic Connect.
Test the device before gluing it shut again.
No soldering is required during this process. Check our installation tutorial for video guides.