Hand‑made fill lights require a basic understanding of electrical circuits; please proceed with caution and in small batches.

In addition to the housing, you’ll need to prepare the following components (excluding tools and consumables such as solder wire, electrical wires, and soldering irons):

1 × 18650 battery

1 × 18650 battery holder

1 × Type-C charging protection board

1 × Toggle switch

1 × LED light board

You can purchase the batteries and battery holder independently, choosing any capacity that suits your needs.

Type-C charging protection board: [Link](https://e.tb.cn/h.Syw41iDNpJSNr0h?tk=daQzfLaA5kc)

Toggle switch: [Link](https://e.tb.cn/h.Syo64kYeoUMRQKm?tk=oRMJfLaAdmA)

LED light board: [Link](https://mobile.yangkeduo.com/goods2.html?ps=jE7xC8qkO9)

The total production cost is approximately 10 RMB.

A simple circuit diagram is available on the product details page—just follow the schematic and solder accordingly.