21700 Power Bank 18650
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Description
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Since well-known contraceptives present new challenges to us, requests for modeling everything related to batteries, energy, and lighting are growing – I continue to make practical things on this topic.
So here's another variation of a universal PowerBank case, designed for different types of cells and field conditions.
Soldier PowerBank – universal case for 21700, 18650, and any Li-Po or Li-Ion
This is a durable, repairable case for a field power bank.
The design features a fully removable internal cassette, making it easily adaptable to various battery types.
🔋 The case fits:
- up to 8 21700 batteries,
- up to 10 18650 batteries,
- or any Li-Ion or Li-Po cells from disposable e-cigarettes and other devices.
Space is provided for a charge indicator, button, wiring, and QC module.
⚠️ Assembly Warning
- Always check the length of the self-tapping screws — screws that are too long can damage the battery, pierce insulation, or cause a short circuit.
- The best assembly technique is nickel strip + spot welding.
- If you don't have a spot welder, you can use copper wire and a soldering iron, but work quickly and carefully, without overheating the cells.
- Remember: Li-Ion is not a toy. Always follow minimal safety rules and contact insulation.
📦 List of Components (BOM)
| Component | Quantity | Note / Recommendation | Link |
|---|---|---|---|
QC 4.0 / QC 3.0 PowerBank Module
| 1 | Main electronics, LED, USB, Type-C | AliExpress |
TZT QC4.0/QC3.0 Dual USB 5V 4.5A LED (alternative board)
| 1.1 | Alternative board with two USB outputs, LED indication, and fast charging support | https://a.aliexpress.com/_EzZfbmk
|
Lithium Battery Charger Board LED Dual USB 5V 2.4A Micro
| 1.2 | Alternative board with two USB outputs, LED indication, and fast charging support | Lithium Battery Charger, LED,
|
Nickel strip or wires
| As needed | For spot welding cells (recommended) | – |
| Short self-tapping screws | 4–6 pcs | Always check the length! | – |
21700 Batteries (optional) | up to 8 pcs | Maximum capacity | – |
18650 Batteries (optional) | up to 10 pcs | Alternative option | – |
Li-Po cells from e-cigarettes (optional)
| any quantity | Suitable thanks to the universal cassette | – |
iPhone / smartphone batteries (optional) | 1–2 pcs or more | Can be installed if the cassette or mounts are adapted |
📌 Additional Information
- Recommended print settings:
- first layer 0.2 mm,
- other layers 0.2 mm.
- The case has a margin of safety (I KNOW YOU THROW THEM FROM DRONES), suitable for field conditions and quick repair.
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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