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Smoke detector
9V
Battery this device uses · 9V
Older smoke alarms use a 9V battery; many newer units take 3× AA or a sealed 10-year lithium battery you cannot replace.
Specifications
| Battery type | 9V |
| Quantity | 1× |
| Voltage | 9V |
| Equivalents | 6LR61, MN1604, 6F22, PP3, 1604 |
| Battery life | 1 year (replaceable) / 10 years (sealed) |
🔍 Battery cross-reference finder
Type any common code to see its voltage, size and interchangeable equivalents.
💡 Replace replaceable batteries once a year and test the alarm monthly. Replace the whole unit every 10 years.
Frequently asked questions
- What battery does the smoke detector take?
- It uses a 9V, 9V. Older smoke alarms use a 9V battery; many newer units take 3× AA or a sealed 10-year lithium battery you cannot replace.
- What is a good replacement for the 9V?
- Equivalents you can use: 6LR61, MN1604, 6F22, PP3, 1604.
- How do I replace it?
- Replace replaceable batteries once a year and test the alarm monthly. Replace the whole unit every 10 years.