A lightsaber kill key, sometimes called a kill plug, is a small piece that you install in your recharge port while your saber is not in use. Kill keys are often comprised of two major parts: a non-conductive plastic plug (e.g. PVC, nylon, delrin) and an end cap (typically made of plastic or metal). The purpose of the kill key is to stop the flow of current to your lightsaber. Even when you lightsaber is turned off, there’s still a little drain on the battery. A kill key minimizes the drain on the battery.
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Lightsabers using illuminated AV switches often use kills keys. My Saberforge Exile lightsaber features an illuminated AV switch. If I allowed the AV switch to stay illuminated day and night, I would drain the battery. When I install the kill key, the illumination turns off.
Not all lightsabers use kill keys. Ultrasabers, for example, doesn’t use kill keys at all on any of their lightsabers. Also, kill keys much match the size of the recharge port. Many standard recharge ports are designed to accept 2.1mm charging plugs. Other recharge port sizes exist, however.
Kill keys come in various shapes, sizes, and designs. Circular, button-shaped kill keys are among the most common. Kill keys can be simple and functional or ornate and decorative. Some kill keys use logos or designs as well.
Companies That Sell Kill Keys [contains affiliate links]
Note: Please research these companies before purchasing from them.
The Custom Saber Shop United States
Force Relicas (Etsy) Belgium
The Kill Key Factory (Etsy) United States
Rogue Arsenal (Etsy) United States
Saberforge (Etsy) United States
The Saber Armory United Kingdom
Stratagem Sabers United Kingdom
Lightsaber Kill Keys on Shapeways (various sellers)
Watch What is a lightsaber kill key? (Lightsaber Terminology) on YouTube