AA vs AAA — What Is the Difference?
| AA | AAA | |
|---|---|---|
| Voltage | 1.5V | 1.5V |
| Diameter | 14.5mm | 10.5mm |
| Thickness | 50.5mm long | 44.5mm long |
| Capacity | ~2500mAh | ~1200mAh |
| Chemistry | Alkaline | Alkaline |
| Common uses | wall clocks, wireless mice, game controllers, torches, toys | TV remotes, Fire Stick remotes, kitchen scales, small torches |
Are they interchangeable?
No — not interchangeableNo. AA batteries are physically larger than AAA — wider and longer. They will not fit in each other's compartments. Both are 1.5V, but AA has roughly double the capacity of AAA, meaning it lasts much longer between replacements.
The verdict
Use whichever your device requires. They are different sizes and cannot be substituted. AA is the larger, longer-lasting option. AAA is smaller, used in devices where space is limited like TV remotes and small torches.
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