Notes: Battery welding is required. Do not attempt this if you lack experience.
The procedure I follow is to first tin a section of nickel strip, then use a spot welder to attach two sections of nickel strip to the battery’s positive and negative terminals.

Connect one wire from each terminal to the corresponding positive and negative terminals on the protection board.

For the connecting wires, it’s recommended to use thin wires (such as DuPont wires; if you’re concerned about high current, you can bundle several DuPont wires together before soldering—thick wires are too stiff and difficult to route).
The capacity of the 18650 batteries can be any value.

You can search for a 5V/3.1A charging protection board on Taobao, as shown below.

Please note that there are currently two versions of this board available on Taobao; the product page clearly indicates the differences between the two. Simply choose the version that suits your needs.

1. Solder the wires onto the battery.

2. Connect the wires to the protection board.

3. Insert the button into the top cover.

4. Place the shield on the back of the protection board, align the Type-C port, and then insert the top cover.

5. Once the small retaining clips are in place, tighten one M3×10 screw (M3×12 is also acceptable).

6. Align the top cover with the screw holes on the main body and tighten four M3×30 screws.

7. There are eight decorative screws on both the front and back sides; use M3×10 screws (M3×12 is also acceptable).

🔥 Delta Force × Realistic Creation: Fuel Cell Power Bank Replica Project
Dear fellow players of “Delta Force,” when the game’s rare fuel cell leaps off the screen and transforms into a real-world object you can hold in your palm, this time we don’t just want to “collect” it—we want to make it the core energy source for sustained operations on the battlefield!
📋 Project Highlights
Replica Prototype: The rare “fuel cell” item from “Delta Force”
Modified Form: A full-scale 3D-printed model combined with a practical power bank (retaining the original tactical appearance while integrating an internal charging module, offering both display and functional utility)
Open-Source Platform: The project has been made available on an open-source platform, complete with full modeling files, assembly instructions, and modification plans, all of which can be directly downloaded, printed, and modified.
🛠️ Breakdown of Creative Details
Precise Replication: Based on the in-game fuel cell’s design, the physical model faithfully reproduces every angle and edge, uses real screws to fill in details, and incorporates key features such as the HAVOK logo, delivering an authentic tactical feel;
Practical Reconfiguration: Redundant internal structures have been removed, and a power bank core module has been integrated while preserving the original top-port layout, ensuring that the original aesthetic is maintained while adding portable charging functionality—making it easy to carry around without any hassle;
Attention to Detail: The entire model is 3D-printed in one piece, with a matte finish, anti-slip texture, and reinforced edges, capturing the “hardcore durability” characteristic of the in-game item, so it looks great whether displayed or used daily.
🎯 Open Source and Co-Creation
The complete modeling files, printing parameters, and modification steps have now been made openly available on the platform. Whether you’re a player who wants to replicate a purely display-oriented model or an enthusiast eager to modify a functional item, you can download the materials, freely adjust the details, optimize the module layout, and collaboratively create your very own “Delta-exclusive energy core.”
✨ In a Nutshell
Taking a “rare in-game item” and turning it into a portable, real-world power solution that combines tactical appeal with practical value—that’s the ultimate tribute to our love of gaming!