Skywampa, a United Kingdom based Etsy seller [AFFILIATE LINK], offers multiple designs of ‘power cell’ style battery decals for both AA batteries and 18650 Lithium Ion batteries, two battery types commonly used in lightsabers. The ever popular Star Wars: The Black Series Force FX lightsabers use AA batteries, for example.
The battery decal designs pair muted, metallic colors like chrome and gold with other design flourishes like mesh imagery and some aurebesh text.
These ‘power cell’ battery details are uncommon, if not unique. I have not seen any other custom saber companies offering ‘power cell’ battery decals like these. Since lightsaber enthusiasts are often pretty detail oriented about lightsaber appearance, adding a ‘power cell’ decal would be an easy and relatively inexpensive way to give the inside of a lightsaber a more authentic, ‘in universe’ appearance.
In addition to making battery decals, Skywampa also manufactures: clamp cards, crystal chambers, stands, and other lightsaber parts.
Skywampa Etsy store [AFFILIATE LINK]: