100W PD 20000mAh DIY Power Bank Case

This high-power DIY power bank case supports four 21700 batteries to build a 20000mAh portable charger with up to 100W PD fast charging, suitable for laptops, smartphones, tablets, and other USB devices. It features dual Type-C and USB outputs with wide fast-charge protocol support, a clear LED display for real-time power monitoring, and a durable transparent body for a modern look. Ideal for travel, camping, and emergency use, it offers stable two-way fast charging and airline-safe portability, giving you the freedom to create your own powerful custom power bank.