Calculate physical battery size and form factor compatibility.
Select Battery Type
Physical Specs
Typical Weight23 g0.81 oz
Diameter14.5 mm
Length50.5 mm
Volume~8.3 cm³
AA
About this calculator
Overview
Battery size refers to physical dimensions and form factor standards (AA, AAA, 18650, etc.). Choosing the right size ensures device compatibility. Different sizes offer varying capacity and current capabilities.
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Pro Tips
Check device specifications for required battery size.
Lithium-ion 18650 cells are common in flashlights and laptops.
AA batteries are 14.5mm × 50.5mm; AAA are 10.5mm × 44.5mm.
Consider rechargeable options for frequently used devices.
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Fun Facts
"18650 batteries are 18mm × 65mm (hence the name)."
"AA batteries typically have 2000-3000 mAh capacity."
"9V batteries contain six 1.5V cells internally."
"Button cell batteries power watches and small electronics."
Formula: Battery Size Codes: First digits = diameter, Last digits = length (mm)
