You're obviously referring to a charging station for the 18650 rechargeable batteries which you use in your lightsaber, so I don't see how this could possibly be incriminating or in contravention of anything here.
The Nitecore intellicharger is cheap, reliable and versatile for USD16.50 and is available on
Amazon.
If you aren't into international online shopping, fstoplights is a great local dealer of flashlights and flashlight accessories (many of which also work well with lightsabers). Check out their battery chargers
here. I've dealt with them before. Super good communication and fast postage of your items.
Alternatively, just get one at a nearby hardware store.