DIY 8x 18650 Power Bank Case with 22.5W Fast Charge – Build the power bank you deserve
Tired of cheap power banks that drain in half a day and charge your phone at a snail’s pace? With this DIY power bank case for 8x 18650 batteries, you are in control of the capacity and the quality. Simply choose your own cells, assemble them, and enjoy a 22.5W fast-charging power bank that outperforms 90% of the pre-packaged options on the market.
Note: The package includes ONLY the case and the internal motherboard. 18650 batteries and charging cables are NOT included. We recommend using high-quality 3000–3500 mAh cells to achieve a real-world capacity of at least 10,000 mAh.
Why choose this power bank case? (Key Advantages):
- True 22.5W Fast Charge — Full support for PD 2.0/3.0, QC 2.0/3.0, and Huawei SCP. It’s not just marketing; your iPhone can reach 50% charge in approximately 30 minutes.
- Bidirectional USB-C DRP — The same port handles both input and output, eliminating the need for extra adapters.
- 5V Pass-through — Charge your devices even while the power bank itself is plugged into a wall outlet—perfect for the office or in the car.
- Universal Compatibility — Supports PPS, FCP, AFC, BC1.2, Apple Fast Charge, and Samsung Fast Charge, covering virtually any phone or tablet from the last 5 years.
- 7 Integrated Electronic Protections — Over-voltage, under-voltage, over-current, short-circuit, IC overheating, over-charging, and over-discharging protection, all on one board.
- Built-in LED Torch — Activated with a long press, ideal for camping, power cuts, or emergencies.
- Customisable Capacity — With 8x 3500 mAh cells, you can achieve a nominal 28,000 mAh; you decide exactly how much power you need.
Details and Performance
At the heart of this case is an advanced fast-charge controller board that automatically detects the optimal protocol for every connected device—no configuration required. The USB Type-C DRP port intelligently switches between input and output roles, while PPS (Programmable Power Supply) support adjusts voltage with 20mV precision between 3.3V and 11V, meeting the requirements of modern devices for safe and efficient charging.
The charging current for the batteries can reach up to 5A total, meaning a full bank of 8x 3000 mAh cells can be recharged in approximately 5–6 hours using an 18W+ PD adapter. Dual inputs—Micro USB and USB Type-C—provide maximum flexibility regardless of the cable you have on hand.
| Parameter | Value / Detail |
|---|---|
| Compatible Battery Count | 8 x 18650 |
| Maximum Output Power | 22.5W |
| USB-A Output | 5V/3A, 9V/2.5A, 12V/1.87A |
| USB Type-C Output | 5V/3A, 9V/2.22A, 12V/1.67A (PD only) |
| Micro USB Input | 5V/3A, 9V/2A |
| USB Type-C Input | 5V/3A, 9V/2A, 12V/1.5A |
| Max Battery Charging Current | Up to 5A |
| Effective Battery Voltage | 3.3V – 4.15V |
| Supported Fast Charge Protocols | PD 2.0/3.0, PPS, QC 2.0/3.0, SCP 22.5W, FCP, AFC, BC1.2, Apple Fast Charge, Samsung Fast Charge |
| Pass-through Function | Yes – 5V via USB-C (simultaneous charge and discharge) |
| Integrated LED | Yes – activated via long press |
| Integrated Protections | Over-voltage, under-voltage, over-current, short-circuit, IC overheating, over-charging, over-discharging |
| Package Contents | Case + motherboard (batteries and cable not included) |
Package Contents
- 1 x Power bank case for 8x 18650 batteries
- 1 x Motherboard with PD & QC 22.5W support
- 18650 batteries not included
- Charging cable not included
Frequently Asked Questions
Which 18650 batteries are recommended for this case?
We recommend using 3000–3500 mAh cells from reputable manufacturers (e.g., Panasonic, Samsung, LG, Molicel). Using 8x 3500 mAh cells provides a nominal 28,000 mAh—enough for 5–6 full charges of a standard smartphone.
Can the power bank be used while it is charging?
Yes. The pass-through function via the USB Type-C port at 5V allows for simultaneous use—you can charge your phone even while the power bank is plugged into a wall charger.
Is it compatible with iPhone and MacBook?
Yes. It supports Apple Fast Charge and PD 2.0/3.0, making it compatible with iPhone 8 and later models, as well as MacBooks that charge via USB-C.
Can I charge multiple devices simultaneously?
Yes—the case features two USB-A ports and one USB Type-C port. The available power is automatically distributed between the connected devices.
How does this differ from a standard case without fast charging?
A standard case typically delivers 5V/1A or 5V/2A—that’s it. This unit automatically negotiates voltage and current with your device, reaching up to 22.5W. The result: charging times are reduced by 50–70% compared to non-fast-charge alternatives.
Does the case come with a warranty?
Yes, this product is covered by a commercial warranty in accordance with local consumer regulations. For further details, please check our warranty page or contact our support team.
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