<h2>Single 18650 Power Bank Shell — One Cell, One Pocket Charger</h2>
<p>You almost certainly own a few 18650 cells already. They are inside old laptop battery packs, retired vape mods, dead torches and power tool batteries — and most of them still hold a useful charge. This <strong>18650 power bank shell</strong> gives one of them a second job: drop a cell in, close the lid, and you have a USB charger small enough to forget about in a pocket.</p>

<p><strong>Before you order:</strong> this is the shell only. No battery and no cable are included. Nothing needs soldering — the cell simply seats against spring contacts.</p>

<h3>Genuinely Pocket Sized</h3>
<p>At 9.5 x 2.5 x 2 cm it is barely larger than the cell inside it. It disappears into a jacket pocket, a glovebox, a camera bag or the side pouch of a rucksack — which is the whole point. A power bank you left at home has no capacity at all.</p>

<h3>What One Cell Actually Gives You</h3>
<p>A typical 3000mAh 18650 holds around 11Wh. After conversion to 5V you can expect roughly 1,800mAh of delivered charge — that is a substantial top-up for a phone, and a complete charge for most earbuds, action cameras, headlamps, GPS units and older MP3 players. It is not a two-charge travel power bank, and we would rather tell you that now than have you find out at an airport.</p>

<h3>Perfect for Salvaged Cells</h3>
<p>If you harvest 18650s from old laptop packs, this shell is the cheapest way to put a tested cell straight back into service. Swap cells whenever you like — nothing is glued, soldered or sealed. Test each salvaged cell's capacity and internal resistance before use, and retire anything that reads poorly.</p>

<h3>Six Colours</h3>
<p>White, black, yellow, green, blue and pink. Useful if you keep several — colour-code them by cell capacity or by which bag they live in. Also the reason these shells turn up so often in school electronics and STEM classes.</p>

<h3>Fitting the Cell — Read This Part</h3>
<p><strong>Check the polarity before you close the lid.</strong> Match the positive and negative ends of the cell to the markings inside the bay. Inserting a cell backwards will destroy the circuit board immediately and permanently, and that damage is not covered by any warranty. It takes five seconds to check and there is no way to undo it.</p>

<h2>Specifications</h2>
<ul>
  <li><strong>Battery bay:</strong> 1 x 18650 lithium cell, 3.7V (not included)</li>
  <li><strong>Assembly:</strong> no soldering, spring contact fitting</li>
  <li><strong>Input:</strong> DC 5V via Micro USB (cable not included)</li>
  <li><strong>Output:</strong> DC 5V USB, [OUTPUT]A</li>
  <li><strong>Dimensions:</strong> 9.5 x 2.5 x 2 cm (3.74 x 0.98 x 0.79 in)</li>
  <li><strong>Colours:</strong> white, black, yellow, green, blue, pink</li>
  <li><strong>In the box:</strong> 1 x 18650 power bank shell only</li>
</ul>

<h2>Safety</h2>
<ul>
  <li>Confirm cell polarity before closing the case. Reverse insertion causes permanent damage.</li>
  <li>Never use a cell with torn or damaged wrapping. Re-wrap it or retire it.</li>
  <li>Do not use or store in high temperatures, in direct sunlight, or in a closed car in summer.</li>
  <li>Charge a newly built unit for the first time where you can see it, on a non-flammable surface.</li>
  <li>Retire any cell that becomes hot, swells, or holds noticeably less charge than it used to.</li>
</ul>

<h2>Frequently Asked Questions</h2>

<h3>Is a battery included?</h3>
<p>No. You supply one 18650 lithium cell. This keeps shipping simple and lets you use a cell you have already tested.</p>

<h3>Do I need to solder anything?</h3>
<p>No. The cell seats against spring contacts inside the bay. Fitting takes a few seconds.</p>

<h3>What cable do I need to charge it?</h3>
<p>A Micro USB cable, which is not included. If your household has moved entirely to USB-C, add one to your order — the unit cannot be recharged without it.</p>

<h3>How much will it charge my phone?</h3>
<p>With a healthy 3000mAh cell, expect roughly half to two-thirds of a modern smartphone battery. Small devices such as earbuds, headlamps and action cameras will charge fully, often more than once.</p>

<h3>Can I use a flat-top or a button-top cell?</h3>
<p>Both fit the spring contacts. Protected cells are slightly longer than unprotected ones and may be a tight fit — check the length before ordering if your cells are protected.</p>

<h3>Can I take it on a plane?</h3>
<p>No. Airlines require a printed watt-hour rating and manufactured battery documentation. A self-assembled unit has neither and will be refused. Use a certified commercial power bank for air travel.</p>

<h3>Will it charge an iPad or a laptop?</h3>
<p>No. The 5V USB output suits phones and small USB devices. Tablets and laptops need far more power than a single 18650 cell can deliver.</p>

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