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

18650 vs. AAAA

Comparing 2 standards across 5 specifications. 5 key differences identified.

Comparing:
18650
AAAA
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 →
AAAA →

A AAAA battery (IEC designation LR8D425) is a 1.5V Alkaline cell measuring approximately 8.3mm in diameter and 42.5mm in length -- smaller than a AAA. It's used in devices with especially tight internal space, such as laser pointers, some styluses, and compact LED penlights.

View full AAAA spec sheet →

Specification Comparison Table

5 Parameters
Parameter / Spec
18650
AAAA
Diameter
18.60 mm 8.30 mm
Overall Length
65.20 mm 42.50 mm
Nominal Operating Voltage
3.60 / 3.70 V 1.50 V
Chemistry
— Alkaline
Nominal Capacity (at 10mA)
— ~625 mAh

Other Alternatives to Compare

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