21×18650 DIY Power Bank Case
PD & Qi Wireless Shell
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Product information
Details worth knowing
Read the available features, specifications and care information for this item.
Build your own high-capacity power bank — 21 × 18650 cells, no soldering, PD and Qi versions.
A spring-basket housing that takes twenty-one flat-top 18650 cells without a single solder joint. Choose the board you need: standard, USB-C Power Delivery, Qi wireless, or PD plus Qi together. The case ships with the motherboard, spring basket, lens and lanyard fitted — you add the cells.
Why you’ll love it
- 21 cells, solder-free Spring baskets hold flat-top 18650s; drop them in and close the shell.
- Four board options Standard, PD, Qi wireless, or PD + Qi combined.
- USB-C PD up to 12 V / 1.5 A PD versions deliver 5 V-3 A, 9 V-2 A and 12 V-1.5 A in and out.
- 15 W Qi wireless (PD+QI) The PD-QI board adds up to 15 W wireless output; the QI-only board does 5 W.
- Built-in flashlight and lanyard Torch lens and wrist lanyard included on every version.
Specifications
| Cell type | 18650 flat-top × 21 (not included) |
|---|---|
| Dimensions | 170 × 84 × 62 mm |
| Weight | ≈230 g empty (case, board, basket, lens, lanyard) |
| T21-PD output / input | 5 V-3 A, 9 V-2 A, 12 V-1.5 A |
| T21 standard output / input | 5 V-2.1 A |
| T12-QI wireless output | 5 W |
| T12-PD-QI output | 5 V-3 A, 9 V-2 A, 12 V-1.5 A, 4.5 V-5 A, 5 V-4.5 A |
| T12-PD-QI wireless output | 15 W |
| Colours | Black and white |
In the box
- 1 × power bank case with motherboard, spring basket, lens and lanyard
Good to know: Batteries are NOT included. Use flat-top 18650 cells only — button-top cells will not seat in the spring basket.
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How do the multi-buy savings work?
Buy 2 and save 5%, buy 3 and save 10%, or buy 4 or more and save 15%. The reduction is applied automatically before payment.
What if the product isn’t right for me?
Read the published returns policy for the current terms. If you need help with an order, contact ShopBirdy.