AA
Nominal 1.50 V
1.50V
Good81%
- Full
- 1.65 V
- Nominal
- 1.5 V
- High-drain cutoff
- 1.2 V
- Low-drain cutoff
- 1 V
- Dead
- 0.9 V
Gradual voltage decline. Can power low-drain devices down to ~0.8V.
Battery Reference Library
Find out whether a battery is still good. Pick the type and chemistry, enter the voltage, and get a plain-language answer.
Check Your Battery
Three questions, one answer. Measure the open-circuit voltage with a multimeter first.
- Step 1 of 4: Battery Type
- Step 2 of 4: Battery Chemistry
- Step 3 of 4: Voltage
- Step 4 of 4: Result
Reference library
Drag a slider to see how each chemistry behaves as it drains.
11 types
AAA
Nominal 1.50 V
1.50V
Good81%
- Full
- 1.65 V
- Nominal
- 1.5 V
- High-drain cutoff
- 1.2 V
- Low-drain cutoff
- 1 V
- Dead
- 0.9 V
Similar characteristics to AA alkaline, but smaller size and capacity.
C
Nominal 1.50 V
1.50V
Good81%
- Full
- 1.65 V
- Nominal
- 1.5 V
- High-drain cutoff
- 1.2 V
- Low-drain cutoff
- 1 V
- Dead
- 0.9 V
Larger capacity than AA, often used in medium-drain devices.
D
Nominal 1.50 V
1.50V
Good81%
- Full
- 1.65 V
- Nominal
- 1.5 V
- High-drain cutoff
- 1.2 V
- Low-drain cutoff
- 1 V
- Dead
- 0.9 V
Largest common cylindrical alkaline, high capacity for long-lasting power.
9V
Nominal 9.00 V
9.00V
Good85%
- Full
- 9.6 V
- Nominal
- 9 V
- High-drain cutoff
- 7.5 V
- Low-drain cutoff
- 6 V
- Dead
- 6 V
High-drain devices often fail at 7-7.5V. Smoke alarms may work down to ~6V.
CR2032
Nominal 3.00 V
3.00V
Good75%
- Full
- 3.2 V
- Nominal
- 3 V
- High-drain cutoff
- 2.6 V
- Low-drain cutoff
- 2.4 V
- Dead
- 2 V
Used in medical devices, LED lights. Remotes and clocks may work down to ~2.4V.
CR2025
Nominal 3.00 V
3.00V
Good75%
- Full
- 3.2 V
- Nominal
- 3 V
- High-drain cutoff
- 2.6 V
- Low-drain cutoff
- 2.4 V
- Dead
- 2 V
Used in power-hungry gadgets. Key fobs and small remotes may function down to ~2.4V.
CR2016
Nominal 3.00 V
3.00V
Good75%
- Full
- 3.2 V
- Nominal
- 3 V
- High-drain cutoff
- 2.5 V
- Low-drain cutoff
- 2.3 V
- Dead
- 2 V
Used in LED lights, glucose monitors. Watches and car remotes may work down to ~2.3V.
CR2450
Nominal 3.00 V
3.00V
Good75%
- Full
- 3.2 V
- Nominal
- 3 V
- High-drain cutoff
- 2.6 V
- Low-drain cutoff
- 2.4 V
- Dead
- 2 V
Used in sensors and LED devices. Clocks and remotes may function down to ~2.4V.
CR1632
Nominal 3.00 V
3.00V
Good75%
- Full
- 3.2 V
- Nominal
- 3 V
- High-drain cutoff
- 2.5 V
- Low-drain cutoff
- 2.3 V
- Dead
- 2 V
Used in wearables and smart keys. Some low-drain applications may work down to ~2.3V.
Li-ion 3.7V
Nominal 3.70 V
3.70V
Good50%
- Full
- 4.2 V
- Nominal
- 3.7 V
- High-drain cutoff
- 3.5 V
- Low-drain cutoff
- 3.2 V
- Dead
- 2.8 V
Common in rechargeable devices. Nominal voltage is 3.6V or 3.7V. Full charge is 4.2V.