# item.guide
Side-by-Side Comparison Cylindrical Cells

14500 vs. 26650

Comparing 2 standards across 4 specifications. 4 key differences identified.

Comparing:
14500
26650
14500 →

A 14500 Li-ion cell measures 14mm in diameter and 50mm in length -- the same physical size as a standard AA battery -- but delivers 3.7V nominal rather than an AA's 1.5V. Because it fits mechanically into AA-sized battery holders, mixing it up with a real AA can destroy 1.5V-only circuitry.

View full 14500 spec sheet →
26650 →

A 26650 Li-ion cell measures 26mm in diameter and 65mm in length, used in high-drain devices like flashlights, power tools, and RC-hobby battery packs. The format is produced in multiple chemistries with different nominal voltages, so '26650' alone does not guarantee a specific voltage.

View full 26650 spec sheet →

Specification Comparison Table

4 Parameters
Parameter / Spec
14500
26650
Diameter
14.00 mm 26.00 mm
Overall Length
50.00 mm 65.00 mm
Chemistry
Lithium-ion Lithium-ion (Li-ion or LiFePO4, varies by product)
Nominal Operating Voltage
3.70 V —

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