Cut the cable of the battery. Take extra care not to short-circuit the two cables! cut each cable individually and make sure the cable ends on the battery are slightly different in length, so they can't accidentally touch each other.

Dispose of the battery according to your local regulations. Again: Be extra cautious as Lithium Batteries are known to easily explode and catch fire.

Also very carefully remove the protective outer foam-wrapping. we will reuse it later.