{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "21700-cell",
 "name": "21700 lithium cell",
 "kind": "standard",
 "category": "Power & cooling",
 "group": "Batteries",
 "year": null,
 "question": "What are the dimensions of a 21700 cell?",
 "tags": [
  "battery",
  "cell",
  "holder"
 ],
 "aliases": [
  "21700",
  "21700 battery"
 ],
 "overall_mm": {
  "length": 70,
  "width": 21,
  "height": 21
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/21700-cell/",
 "sheet_txt": "https://xemstudio.com/objects/21700-cell/sheet.txt",
 "sheet": {
  "basis": "industry standard; nominal values",
  "overall_mm": {
   "length": 70,
   "width": 21,
   "height": 21
  },
  "notes": [
   "Nominal Ø21 × 70 mm; real cells about Ø21.1–21.4 and 70.0–70.5 mm.",
   "Not interchangeable with 18650 holders."
  ]
 },
 "sheet_text": "21700 lithium cell — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/21700-cell/  (CC BY 4.0)\nBasis: industry standard; nominal values\nCatalog version: 2026-10-20\n\nOverall (mm): length 70, width 21, height 21\n- Nominal Ø21 × 70 mm; real cells about Ø21.1–21.4 and 70.0–70.5 mm.\n- Not interchangeable with 18650 holders.\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: List of battery sizes — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/List_of_battery_sizes\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/21700-cell/index.json\nAPI: https://xemstudio.com/api/geometry?object=21700-cell\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "List of battery sizes",
   "url": "https://en.wikipedia.org/wiki/List_of_battery_sizes",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "18650-cell",
  "aa-aaa-cells"
 ],
 "faq": [
  {
   "q": "Are 21700 and 18650 holders interchangeable?",
   "a": "No: 21700 is Ø21.1–21.4 × 70.0–70.5 mm versus Ø18.5 × 65 for 18650."
  },
  {
   "q": "What are 21700 cell dimensions?",
   "a": "Nominal Ø21 × 70 mm; design holders for Ø21.5 × 70.6."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "cell-21700",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/21700-cell/cell-21700.step",
   "stl": "https://xemstudio.com/files/hardware/21700-cell/cell-21700.stl",
   "note": "21700 typical real size Ø21.2 × 70.2"
  }
 ],
 "markdown": "https://xemstudio.com/objects/21700-cell/index.md"
}