18650 Mobile Power Supply DIY Power Bank Case Reusable Spring Design for 2 x 18650 Batteries

This 18650 mobile power supply provides a practical and customisable way to create your own portable charger using two rechargeable 18650 Li-ion batteries (sold separately). The spring-loaded case can be disassembled and reused repeatedly, making it a cost-effective and eco-friendly alternative to disposable power banks. Weighing only 38.5 grams, it is compact enough for daily carry in a bag or pocket. Built-in indicator lights show charging progress, while voltage, over-current, and short circuit protection help safeguard connected devices. Compatible with a wide range of gadgets including iPhone, iPad, Samsung, LG, Sony, MP4 players, PSP, and cameras, it offers a versatile charging solution for home, travel, or work.

Features and Construction

The spring-loaded design and safety protections make this case a reliable foundation for a DIY power bank. Here are the key aspects of its build.

Material and Build

The power supply case is constructed from durable materials (ABS plastic or similar polymer), with a spring mechanism that holds 18650 batteries securely while allowing quick removal. The compact form factor keeps weight to just 38.5g, contributing to its portability. The case can be fully disassembled for battery replacement or cleaning, extending its usable life.

Size and Practical Fit

Designed specifically for two standard 18650 Li-ion rechargeable batteries, the case is sized to fit easily inside a small pouch or pocket. Its lightweight nature makes it convenient for travel or everyday use without adding noticeable bulk to your carry.

Uses and Placement

This DIY power bank case is suited to a range of charging scenarios, from emergency phone boosts to powering gadgets during trips.

Event or Professional Use

Photographers, videographers, or field workers can use this case to keep cameras, recorders, or other USB-powered gear charged without relying on wall outlets. The replaceable batteries mean you can carry multiple sets for longer sessions.

Everyday Home Use

At home, it works as a backup charger for smartphones and tablets during power cuts, or as a dedicated power source for MP4 players and gaming devices. The indicator light lets you see when charging is complete, avoiding wasted time.

Benefits and Buying Value

The reusable, disassemblable design and safety features deliver practical value for anyone who needs reliable portable power.

Reuse and Low Maintenance

Because the case can be opened and reassembled, you can replace worn batteries rather than discarding the whole unit. This reduces electronic waste and saves money over time. No specialist tools are required for battery swaps.

Why Choose This Product

If you already own 18650 batteries, this case gives you a custom power bank at minimal extra cost. The built-in protections add peace of mind, while the wide device compatibility means it works with most USB-charged electronics. Choose between black and white finishes to match your gear.