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
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)
