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18650 battery
18650
3.7V · 18 × 65 mm · Lithium-ion (rechargeable)
The 18650 is a rechargeable 3.7V Li-ion cell, not a disposable battery.
Specifications
| Battery type | 18650 |
| Voltage | 3.7V |
| Size | 18 × 65 mm |
| Chemistry | Lithium-ion (rechargeable) |
| Equivalents | No alkaline equivalent — Li-ion only |
| Common uses | High-output flashlights, power banks, laptop packs, vapes. |
🔍 Battery cross-reference finder
Type any common code to see its voltage, size and interchangeable equivalents.
💡 It is 3.7V — never put it where a 1.5V cell is expected.
⚠️ 18650 cells can vent or catch fire if shorted, over-discharged or charged on the wrong charger. Use a quality protected cell and a proper Li-ion charger.
Frequently asked questions
- What is a 18650 battery equivalent to?
- The 18650 is interchangeable with: No alkaline equivalent — Li-ion only. These share the same size and voltage.
- What voltage is a 18650 battery?
- A 18650 is 3.7V, measuring 18 × 65 mm.
- What is a 18650 battery used for?
- High-output flashlights, power banks, laptop packs, vapes.