Wiktionary
depower
vb. (context transitive English) To reduce the power of.
Usage examples of "depower".
He saw himself in the Pelek Baw alley, staring in disbelief at h depowered lightsaber.
When we do, you can show ’Ao and Mike how to divide it without depowering one of the halves.
The idea of completely depowering it was probably unnecessary, but it was safe, and neither man was interested in finding out how the Japanese treated spies, for that was what they were.