A primary-school kid builds a 20,000mAh power bank — a 20,000mAh high-capacity, fully transparent cyberpunk-style one for a neighbor
Creator’s own settings as stated in the video (timestamps link to the moment). Not official values — test on scrap first.
Bill of materials
Welder, accessories, consumables and parts used in this build; quantities and specs are editable Download BOMDescription
Primary-schooler Shuyang builds a 20,000mAh fully transparent cyberpunk power bank for a neighbor (3905 likes): materials are a board / shell / battery tabs / 6 × 18650; AWithZ spot welder for the tabs, welds the negatives, welds the leads, flattens the cells, solders the red and black leads to the board, fits the shell and screws, peels the film; 22.5W PD fast charge lights up; comments correct him — no fish paper on the positives is unsafe, keep the positive weld inward or a missed weld can blow the tab, and strap the cells
‘Shuyang’s got a job’ — a neighbor asked him to build a power bank and the materials are in: power-bank board, shell (transparent yellow), battery tabs (nickel strip), cells (6 × 18650, bought earlier). Out comes the AWithZ ‘touch welder’ (spot welder) and he starts welding the tabs; welds the negatives; welds the leads; flattens the cells out (two groups of 3P?); solders the red and black leads to the board; fits the shell and screws; shell on, see whether it charges: it lights up, and it’s fast charge; peel the film, slip the sleeve on, peel the outer film, fit the lid, screws in, done; detail shots, the transparency looks great, cyberpunk style; charge test again, fast charging, the board he bought is 22.5W PD; ‘Dad, the power bank’s yours now.’ Comments (823): fish-paper rings on the positives, fish paper under the folds, strap the cells, keep the positive weld inward — a missed weld can blow the tab (9); no fish paper on the positives is unsafe (3, creator: the cells have 2 layers of insulation of their own); makes me want a spot welder (3); same UF20B, press the pen down a bit harder before triggering, fewer sparks and nicer welds; better to buy a CUKTECH, 50-odd yuan for 20,000mAh at 55W (it’s for hands-on practice); this kind of board leaks and starves the cells after two months unused; 22.5W is slow charging.
Outcome
| Goal | Build a 20,000mAh transparent power bank for a neighbor |
| Build | 6 × 18650 + 22.5W PD board + transparent shell |
| Result | Cased and finished, 22.5W fast charge lights up · verified on camera: Charging display shows 22.5W fast charge at 96–106s and 139–149s |
Steps5 steps · click a frame to jump
1. Taking the job; materials: board, shell, tabs, 6 cellsThe neighbor asked for a power bank and the materials are all in; board, shell, tabs, cells (bought earlier).
00:00 – 00:16
2. AWithZ spot welder for the tabs; weld the negatives; weld the leadsOut comes the AWithZ touch welder and he starts welding the tabs; welds the negatives; then welds the leads.
00:16 – 01:02
3. Flatten the cells; solder the red and black leads to the board; fit the shell and screwsFlatten the cells out; solder the red lead to the board; then the black lead; put the shell on and do up the screws; start casing.
01:10 – 01:33
4. Charge test: lights up, fast charge; peel film, sleeve on, lid on, screws inAssembled, see whether it charges, it lights up and it’s fast charge; peel the film; slip the sleeve on; peel the outer film; fit the lid, screws in.
01:36 – 02:02
5. Finished details: transparent cyberpunk; 22.5W PD fast charge; handed to DadFinished detail shots, transparent and pretty, cyberpunk; fast-charge test again, the board is 22.5W PD; Dad, the power bank’s yours now; see you next time.
02:07 – 02:38
Bill of materials
| Power-bank kit ×1 | Transparent shell + 22.5W PD board · Shell and circuit |
| 18650 ×6 | Battery pack |
| Battery tabs (nickel strip) | Connections |
| AWithZ spot welder (UF20B) ×1 | Spot welding |
| Soldering iron / screwdriver | Soldering leads, casing |
Creator’s tips
- Comments: fish-paper rings on the positives, fish paper under the folds, strap the cells, keep the positive weld inward so a missed weld can’t blow the tab
- Comments: on the UF20B press the pen down firmly before triggering, fewer sparks and nicer welds
Pitfalls
- No fish paper on the positives (safety dispute)
- Comments: this kind of board leaks and starves the cells after two months unused
Li-ion safety
- A child operating a spot welder and Li-ion cells; missing positive-end insulation flagged by several comments
Quotes
Comment insightsanswered 2 · open 0 · corrections 3
Answered by the creator
Corrections from viewers
Only thing to say is it gives a kid a chance to build something; better to buy a CUKTECH, ¥50-odd gets you the 20,000mAh CP25 with 55W fast charge, built-in cable and 3C certification; this hand-made one surely has no 3C and low power, and materials alone probably cost more than ¥50
Reply @bug3210:
Only thing to say is it gives a kid a chance to build something; better to buy a CUKTECH, ¥50-odd gets you the 20,000mAh CP25 with 55W fast charge, built-in cable and 3C certification; this hand-made one surely has no 3C and low power, and materials alone probably cost more than ¥50
Reply @bug3210:
Only thing to say is it gives a kid a chance to build something; better to buy a CUKTECH, ¥50-odd gets you the 20,000mAh CP25 with 55W fast charge, built-in cable and 3C certification; this hand-made one surely has no 3C and low power, and materials alone probably cost more than ¥50
Reply @bug3210: