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

14500 vs. 18650

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

Comparing:
14500
18650
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 →
18650 →

An 18650 Li-ion cell measures 18.6mm in diameter and 65.2mm in length. It operates at 3.6V/3.7V nominal, charges up to 4.2V max, and has a discharge cutoff of 2.5V with capacities between 2200 and 3500 mAh.

View full 18650 spec sheet →

Specification Comparison Table

4 Parameters
Parameter / Spec
14500
18650
Diameter
14.00 mm 18.60 mm
Overall Length
50.00 mm 65.20 mm
Nominal Operating Voltage
3.70 V 3.60 / 3.70 V
Chemistry
Lithium-ion —

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