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

26650 vs. D Battery

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

Comparing:
26650
D Battery
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 →
D Battery →

A D battery (IEC designation LR20, ANSI 13A) measures 34.2mm in diameter and 61.5mm in length -- the largest common cylindrical primary cell. Alkaline D cells output 1.5V nominal, with typical capacity in the range of roughly 12,000 to 20,000 mAh depending on discharge rate.

View full D Battery spec sheet →

Specification Comparison Table

4 Parameters
Parameter / Spec
26650
D Battery
Diameter
26.00 mm 34.20 mm
Overall Length
65.00 mm 61.50 mm
Chemistry
Lithium-ion (Li-ion or LiFePO4, varies by product) —
Alkaline Voltage
— 1.50 V

Other Alternatives to Compare

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