DIY 4×21700 Battery Holder Power Bank Case with Dual USB Type-C

This DIY shell serves as a 4-slot 21700 battery holder combined with a power bank case, allowing you to assemble a portable charger suited to your needs. Its design supports 21700 lithium-ion cells, offering a flexible energy storage option for tech enthusiasts and DIYers.

With dual USB and Type-C output ports, it can power multiple devices including iPhones and Xiaomi smartphones, making it a versatile charger for daily use.

Equipped with both traditional USB and modern Type-C ports, this power bank case lets you connect and charge two devices simultaneously. It ensures compatibility across a wide range of mobile phones and gadgets that require USB or Type-C cables.

• Supports simultaneous dual device charging
• Compatible with iPhone and Xiaomi models
• Includes Type-C port for fast, reversible connection

Specifically designed to securely hold four 21700 batteries, this case safeguards your cells while maintaining easy access for replacement or maintenance. Its compact size enables safe transportation and storage of power cells in one handy case.

• Holds four 21700 lithium-ion battery cells
• Robust shell protects batteries during use and storage
• Compact and lightweight design

• Battery type supported: 21700 lithium-ion cells (4 slots)
• Output ports: Dual USB and Type-C
• Compatible devices: iPhone, Xiaomi, and other mobile phones

• DIY shell case for 4×21700 batteries
• Integrated dual USB and Type-C charging ports