Mini power bank

🔥 Handmade expert ecstasy! The most detailed self-made power bank strategy on the whole network is open source! From the circuit principle to the bill of materials, we will teach you how to create an exclusive mobile power supply, which is more rewarding than saving half of the money compared to buying a finished product!📦 There are zero obscure terms throughout the process, and it is easy for beginners to get started! The exclusive lightning protection guide allows you to avoid safety pits, and there are more inspiration for super cool appearance transformation, and you have to play with personality when charging!👉 Click to download to unlock the joy of technology DIY, so that charging is no longer the same!Link to purchase the board： https://e.tb.cn/h.6lDqWPcjmCAPvIt?tk=yDOjVeGCZNuAccessories Required:18650 battery*2M3 *10 screw *4Charging protection board*1Wire nickel stripThe following are the detailed steps: First, prepare two 18650 batteries: Use a soldering iron or spot weldi