The battery data cable is adhered to the battery board and logic board. In the next few steps, you'll disconnect it, separate its adhesive, and remove it.

Heat an iOpener and place it on the battery data cable for 30 seconds to soften its adhesive.

If you don't have an iOpener, you can use a hair dryer to lightly heat the cable. Be careful not to overheat the battery, as doing so is a fire hazard.