Standard sizes · 1.5 V
AAAequivalents
The AAA is also sold as LR03, MN2400, 24A and Micro. They are the same cell under different brand and standard names, so any of them fits.
Same battery, other names
- LR03
- MN2400
- 24A
- Micro
Size and specs
- Voltage
- 1.5 V
- Size
- 10.5 × 44.5 mm
- Chemistry
- Alkaline (LR03). Also sold as lithium (FR03), NiMH rechargeable (HR03) and zinc-carbon (R03).
- Capacity
- about 1,000 to 1,200 mAh (alkaline)
- Type
- Standard sizes
What uses an AAA
Typical devices and how long a fresh set usually lasts. Yours may differ.
| Device | Takes | Lasts |
|---|---|---|
| TV remote | 2 × AAA | about 2 years |
| Bathroom scale | 4 × AAA | about 2 years |
| Wireless keyboard | 2 × AAA | about a year |
| Headlamp | 3 × AAA | about 6 months |
| Bike light | 2 × AAA | about 3 months |
| Laser measure | 2 × AAA | about a year |
AAA vs AA and AAAA
Batteries people mix up with the AAA. Close, but not the same.
| Battery | Size, voltage | Difference |
|---|---|---|
| AAA | 10.5 × 44.5 mm1.5 V | This page. |
| AA | 14.5 × 50.5 mm1.5 V | Wider and longer (14.5 × 50.5 mm). It won't fit an AAA slot. |
| AAAA | 8.3 × 42.5 mm1.5 V | Thinner (8.3 mm). Used in styluses and some pen lights, not in AAA devices. |
Good to know
- LR03 is the IEC name, MN2400 is Duracell's, 24A is the ANSI code and Micro is the German name.
- Remotes and keyboards draw so little that a cheap alkaline lasts for years. Save lithium AAA cells for headlamps and bike lights.
- Change every cell in a device at once, and don't mix brands, ages or chemistries.
Questions
What is the equivalent of an AAA battery?
The AAA is also sold as LR03, MN2400, 24A and Micro. They are the same cell under different brand and standard names, so any of them fits.
What size is an AAA battery?
10.5 × 44.5 mm, 1.5 V. Alkaline (LR03). Also sold as lithium (FR03), NiMH rechargeable (HR03) and zinc-carbon (R03).
What uses an AAA battery?
Common devices include tv remote, bathroom scale, wireless keyboard, headlamp, bike light and laser measure.
Battery Inventory for iPhone and iPad
Never look up the AAA again.
Battery Inventory remembers which battery every device in your home takes, reminds you when one is due, and counts the spares in your drawer, so you buy the right cell before the old one dies. The finder in the app knows every code on this page. Search any of them, or point the camera at a coin cell to read it.
- Battery change reminders, free
- Monthly smoke and CO alarm test reminders
- A spares drawer and shopping list
- Cordless tool packs and chargers too
No account needed. Smoke and CO alarm features are reminders only: the app can't see or test your alarms.
