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

18650 vs. 26650

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

Comparing:
18650
26650
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 →
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
18650
26650
Diameter
18.60 mm 26.00 mm
Overall Length
65.20 mm 65.00 mm
Nominal Operating Voltage
3.60 / 3.70 V —
Chemistry
— Lithium-ion (Li-ion or LiFePO4, varies by product)

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