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Trax2 summary of rechargeable lithium-ion (Li-ion) battery sizes and their common use.

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Everything you need to know about rechargeable lithium-ion (Li-ion) batteries

Everything you need to know about rechargeable lithium-ion (Li-ion) batteries

1. 10180

  • Dimensions: 10mm diameter × 18mm length.
  • Features: Ultra-compact, ideal for keychain or micro flashlights.
  • Capacity: 70–120 mAh.
  • Use Case: Backup lights or minimalist EDC tools. Drawbacks include limited runtime and specialized charging requirements.

2. 14500

  • Dimensions: 14mm diameter × 50mm length (same as AA batteries).
  • Features: Higher voltage (3.7V) compared to AA, making it suitable for compact flashlights with demanding power needs.
  • Capacity: 600–1200 mAh.
  • Use Case: Penlights, mini flashlights, and devices requiring AA-like size with boosted performance.
100s of batteries

3. 16340 (CR123A Rechargeable)

  • Dimensions: 16mm diameter × 34mm length.
  • Features: Rechargeable alternative to disposable CR123A. Offers high voltage (3.7V) and compatibility with tactical or compact flashlights.
  • Capacity: 700–1000 mAh.
  • Use Case: Weapon-mounted lights, security devices, and outdoor gear.

4. 18350

  • Dimensions: 18mm diameter × 35mm length.
  • Features: Shorter version of the 18650, balancing portability and power. Popular in custom flashlights.
  • Capacity: 800–1200 mAh.
  • Use Case: Compact EDC lights requiring high output in a small form factor.

5. 18650

  • Dimensions: 18mm diameter × 65mm length.
  • Features: Industry standard for high-performance flashlights. Offers excellent capacity (2300–3600 mAh) and reliability.
  • Use Case: Tactical, outdoor, and long-runtime flashlights. Also used in electric vehicles.

The brightest flashlight you will ever need with 4×18650 rechargeable lithium-ion (Li-ion) batteries

6. 21700

  • Dimensions: 21mm diameter × 70mm length.
  • Features: Larger capacity (4000–5000 mAh) than 18650, with modern designs prioritizing efficiency.
  • Use Case: High-lumen flashlights, bike lights, and applications requiring extended runtime.

7. 26650

  • Dimensions: 26mm diameter × 65mm length.
  • Features: High capacity (4000–6000 mAh) for heavy-duty use.
  • Use Case: Searchlights, floodlights, and flashlights requiring sustained high output.

8. D-Size Lithium (Specialized)

  • Dimensions: Standard D-cell size (34.2mm × 61.5mm).
  • Features: Rechargeable via USB-C, offering ~1000 cycles. Combines Li-ion efficiency with traditional D-cell compatibility.
  • Capacity: ~1000 mAh (varies by brand).
  • Use Case: Large flashlights, toys, and devices traditionally using D batteries.

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