Side-by-Side Comparison
Cylindrical Cells
21700 vs. AA Battery
Comparing 2 standards across 4 specifications. 4 key differences identified.
Comparing:
21700
AA Battery
A 21700 Li-ion cell measures 21.1mm in diameter and 70.4mm in length. Offering 4000 to 5000 mAh capacity at 3.6V nominal, it provides up to 50% more energy density than an 18650 cell.
A standard AA battery measures 14.5mm in diameter and 50.5mm in length. Primary Alkaline cells output 1.5V, NiMH rechargeable cells output 1.2V. Inserting a 3.6V 14500 Li-ion cell into 1.5V AA devices destroys the circuit.
Specification Comparison Table
4 Parameters| Parameter / Spec | ||
|---|---|---|
|
Diameter
|
21.10 mm | 14.50 mm |
|
Overall Length
|
70.40 mm | 50.50 mm |
|
Nominal Capacity
|
4000–5000 mAh | — |
|
Alkaline Voltage
|
— | 1.50 V |