18650 and 21700 battery box

For anyone building power banks and torches for power cuts. Each cell stands in its own slot: cans and contacts touch neither each other nor any metal. Charged cells go plus up, flat ones minus up.

Order the 16-cell case — 420 UAH All versions and prices

Versions and prices

Fixed price: printed in PETG, with the hinge pin, EVA foam and screws included where needed. Printed to order from 1 day and shipped by Nova Poshta across Ukraine.

16-cell case
The hinged lid stays open on a stop and closes with a latch: the case will not open upside down in a bag. The lid carries the legend “+ up — charged”.

Size
91 × 103 × 75 mm
Included
hinge pin, EVA foam

420 UAH

Order
6- and 4-cell modules
The modules join with a dovetail into a row of any length, so the row grows with your stock. Two colours of modules — for charged and flat cells.

Size
row 183 × 45 mm
Included
3 modules

420 UAH 6 + 6 + 4 set

Order
Pocket case
The cap clicks onto two spring tabs, with no metal: keys and coins in a pocket cannot reach the contacts. Also available for 4 × 18650 and 2 or 4 × 21700.

Size
46 × 25 × 74 mm
Included
EVA foam

160 UAH 2 × 18650

Order
19-cell honeycomb tray
The cheapest: staggered slots like a honeycomb, so 19 cells take less space than 16 in the case. Push a cell out with a finger through the hole in the bottom.

Size
106 × 95 × 26 mm
Included
tray without a lid

180 UAH

Order
2 × 8 wall dispenser
Two channels of 8: charged on the left, flat on the right. Load from the top, take from the bottom — the cell that has waited longest comes out first.

Size
140 × 25 × 181 mm
Included
3 screws with wall plugs

390 UAH

Order
20 × 21700 stacking trays
For workshops building battery packs: the trays stack, and cones centre the one on top. Colours and the label area mark groups by capacity and resistance.

Size
139 × 114 × 76 mm
Included
label area

290 UAH per tray, batches from 10

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Didn’t find your version?
Tell us what you need — we’ll pick one of ours or make one just for you.
- A different size or colour
- Your text, name or logo
- A completely different shape — we’ll model it ourselves
Message us
We reply within an hour during working hours. Modelling is charged separately.

Why not loose in a box

The can of an 18650 cell is the negative terminal, and the positive is on the end. Loose in a box, cells touch each other, keys or paper clips, and any bit of metal can short them. In our boxes each cell stands upright in its own slot, with at least 1.4 mm of plastic between slots and no springs, magnets or other metal.

Charged or flat — visible from above

No electronics needed: a charged cell goes plus up, a flat one minus up. The legend is embossed on the lid of the case, the modules and trays come in two colours, and the dispenser keeps charged and flat cells in separate channels.

Made for your cells

The slots are sized for the largest cells in Samsung, LG and Molicel datasheets: 18650 up to Ø18.7 × 69.7 mm with a protection board, 21700 up to Ø21.7 × 70.8 mm. We also print the case, modules, honeycomb and pocket case for 21700, and the case with 12 or 20 slots. For standard 65 mm cells we add EVA foam to the case and pocket case so they do not rattle.

Limitations

PETG softens from about 70 °C: do not leave the box in a car in the sun or near a heater — heat harms the cells too.
The honeycomb tray has no lid and is meant for a shelf or drawer. For a bag, take the case or the pocket case.
The wall dispenser takes unprotected 18650 cells up to 65.3 mm. For protected ones we lengthen the channels.
The modules join only in a row; rows stand side by side.
Protected 21700 cells 73–76 mm long do not fit the pocket case or under the top tray — we will enlarge them to your size.

Close-up

The 16-cell cassette on a workbench next to a charger and a flashlight.

The 2 × 8 wall dispenser above a workbench.

Charged cells stand plus up, flat ones minus up: visible at a glance, no tester needed.

One module’s tongue slides into its neighbour’s groove — the module is lowered from above.

Images are renders of the 3D model — this is how the product will look once printed.

FAQ

Do protected cells with a board fit?

Yes, the case and pocket case take 18650 cells up to 69.7 mm long and Ø18.7 mm — that is, protected ones. The wall dispenser is for standard 65 mm cells; for protected ones we lengthen the channels.

Is there a 21700 version?

Yes: the stacking trays are made for 21700, the pocket case comes for 2 and 4 × 21700, and we print the case, modules and honeycomb with 21700 slots. We will quote another size as soon as you write.

How do I mark charged cells?

Put a charged cell plus up and a flat one minus up. The legend is embossed on the lid of the case, the modules come in two colours, and the dispenser has separate channels.

Won’t the case open in a bag?

No: the latch clicks behind a tooth and holds the lid even when a full case is turned upside down and shaken. It opens when you pull the tab back with a finger.

Do you sell in batches for workshops?

Yes: stacking trays in batches from 10 at 290 UAH each, with colours marking cell groups. For other quantities or other boxes, write to us.

Can I keep it in a car?

The case and pocket case — yes, but not in the sun: PETG softens from about 70 °C, and heat harms the cells too.

Other products

All ready-made products (40)All 3D printing services

Need a different grid or size?

The case comes with 12, 16 or 20 slots and the pocket case for 1–6 cells. Tell us how many cells of which type you store and we will quote a price.

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18650 and 21700 battery box

Versions and prices

16-cell case

6- and 4-cell modules

Pocket case

19-cell honeycomb tray

2 × 8 wall dispenser

20 × 21700 stacking trays

Didn’t find your version?