10 Best Batteries For Carbon Monoxide Detector in 2026

Finding the right power source for a carbon monoxide detector starts with confirming the battery type, voltage, and model requirements. A dependable unit also needs to remain ready during outages, provide clear status alerts, and fit the placement plan for your home, rental, travel space, or other monitored area.

This guide compares ten relevant products, including dedicated 9-volt replacement batteries and complete battery-powered carbon monoxide alarms. The evaluation considers supplied specifications, device compatibility, sensing technology, alarm visibility, battery convenience, portability, maintenance indicators, storage guidance, and the added value of multipacks.

Each numbered review explains who the product best suits, which strengths matter most, and where limitations may affect a buyer. The top selections highlight a portable alarm with included batteries, a convenient four-pack of alkaline 9-volt cells, and a well-regarded six-battery option for households maintaining several devices. Stock and promotions can change.

Top 3 Picks for Best Batteries for Carbon Monoxide Detector

Top 10 Best Batteries for Carbon Monoxide Detector in 2026 Compared

This side-by-side overview distinguishes replacement 9-volt batteries from complete battery-powered alarms, making it easier to identify the product that matches the device you already own or the protection setup you need to install.

1. Kidde AA-Powered CO Detector – Best Portable Protection

4.7Editor scoreCheck price on Amazon

Kidde AA-Powered CO Detector

Two included AA batteries

Electrochemical CO sensing

85-decibel audible alarm

Event Memory detection history

The Kidde Carbon Monoxide Detector is a complete portable alarm rather than a loose replacement battery, which makes it the most practical starting point for someone seeking dependable carbon monoxide monitoring without wiring. It carries a 4.7 rating and includes two AA batteries, allowing the unit to be installed and used right away. Its electrochemical sensor, audible warning, and visual status lights make it particularly approachable for households, renters, and travelers.

Pros

• Batteries included for immediate setup
• Works without hardwired power
• Suitable for home or travel
• Clear green and red indicators
• Useful detection event memory

Cons

• AA batteries are not included in later replacements
• Must follow the manual for battery replacement

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The strongest benefit is the combination of portability and useful event information. The detector can be mounted on a wall or placed on a tabletop, while its battery operation allows it to continue monitoring during a power failure. A green LED communicates that power is available, whereas the red LED and 85-decibel alarm signal carbon monoxide detection. Event Memory records the most recent detection or test, adding a helpful layer of context after an alarm.

There are some practical trade-offs. Because it is a complete detector, buyers who only need a replacement 9-volt cell may consider one of the battery packs later in this guide. The included batteries make first use convenient, but owners will eventually need replacements, and battery life should be evaluated against the manufacturer’s guidance rather than assumed. The third edition designation also makes it important to read the supplied manual for current test and replacement procedures.

This is the strongest recommendation for buyers who want an all-in-one, portable solution or need a supplemental alarm for a home, rental, travel location, or additional level. It avoids the complexity of hardwired installation while providing audible and visual alerts. Buyers should place it according to the manual’s guidance, test it routinely, and replace batteries on the stated schedule.

Useful Status and Event Memory

The separate green and red LEDs help users distinguish normal power from a carbon monoxide condition without relying on sound alone. Event Memory adds value by recording the last detection or test, which can help a household understand whether the alarm was recently triggered.

Flexible Placement During Outages

Because the detector uses two AA batteries, it can operate without household wiring and continue monitoring during a power failure. The same flexibility makes it suitable for tabletop placement in a rental, guest room, cabin, or other location where permanent installation may be impractical.

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2. EBL Alkaline 9V Four-Pack – Best Multipack Value

4.6Editor scoreCheck price on Amazon

EBL Alkaline 9V Four-Pack

Four alkaline 9-volt cells

Up to seven-year shelf life

Advanced leakage-resistant seal

Multiple household device support

The EBL 9 Volt Batteries 4 Pack is a practical replacement-battery option for anyone whose carbon monoxide detector accepts a 9-volt alkaline cell. It has a 4.6 rating and supplies four batteries, making it easier to maintain multiple alarms, keep a fresh spare, and prepare for recurring replacements without making separate purchases. The stated shelf life of up to seven years also makes it suitable for building a small household battery reserve.

Pros

• Four cells support several devices
• Explicit CO-alarm compatibility
• Long advertised storage life
• Useful beyond household safety

Cons

• Replacement frequency depends on device
• Alkaline cells are not rechargeable

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Its core strength is straightforward compatibility and storage-conscious construction. The product information identifies smoke detectors, carbon monoxide alarms, and numerous other 9-volt devices as appropriate applications. Advanced seal technology is designed to reduce leakage during storage, while steady-voltage performance supports consistent device operation. That combination is particularly helpful for owners who want batteries available before an urgent replacement becomes necessary.

The main limitation is that the four-pack is not a complete detector. It cannot provide carbon monoxide sensing or an alarm on its own, so it requires a separate compatible unit. Shelf life should also not be confused with in-device service life, which depends on the detector, operating conditions, and how often the alarm is tested. Buyers should use the battery type specified by their detector manufacturer.

This is a sensible choice for households that already own compatible alarms or for shoppers building a replacement stock. The four-cell format offers more flexibility than a single battery and can cover several devices. It is particularly compelling for people who want a budget-conscious 9-volt option without giving up the convenience of multipack storage.

A Ready Supply for Multiple Alarms

A four-pack gives owners a simple maintenance strategy: one cell can be installed, one can remain immediately available, and the others can cover additional compatible alarms or future replacement cycles. This reduces the chance of discovering an empty or unsuitable battery only when protection is urgently needed.

Storage-Focused Leakage Protection

The sealed design is especially useful when spare batteries may sit in a drawer, cabinet, or emergency kit for extended periods. It does not eliminate the need to store cells properly, but the stated leak-resistant technology adds useful protection for a household battery reserve.

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3. Duracell Coppertop 9V Six-Pack – Best Household Backup

4.8Editor scoreCheck price on Amazon

Duracell Coppertop 9V Six-Pack

Six alkaline 9-volt cells

Five-year storage guarantee

Carbon monoxide detector compatible

Professional-device applications

The Duracell Coppertop 9V Battery, 6 Count, stands out as the strongest premium replacement option in this guide. Its 4.8 rating is the highest among the ten products, and the six-battery format is well suited to homes with multiple compatible alarms. It combines the brand’s home-safety positioning with a five-year storage guarantee, making it especially relevant for annual maintenance planning.

Pros

• Highest rating in the selection
• Six-cell household reserve
• Guaranteed five-year storage
• Broad compatibility with devices

Cons

• May be excessive for one detector
• Storage guarantee excludes device performance

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The product information explicitly identifies carbon monoxide detectors as a supported application, alongside smoke detectors, security sensors, alarm systems, and emergency devices. That broad compatibility means a household can standardize battery stock around one format. The six-cell quantity also makes the pack useful for keeping spares available rather than waiting until a detector begins warning that service is required.

The principal trade-off is quantity. Someone replacing a single battery may find six cells more than necessary, while a larger household or a property with several alarms can put them to good use. The five-year guarantee concerns storage, not how long a battery will operate after installation. Actual replacement timing should follow the alarm manufacturer’s schedule and the detector’s low-power warning.

For buyers who value a dependable reserve and already have compatible 9-volt devices, this is the most complete premium multipack in the group. Its high rating, broad application range, and storage guarantee make it a strong choice for annual household maintenance, emergency preparation, and keeping fresh replacements close at hand.

One Brand Across Safety Devices

The pack is useful beyond a single carbon monoxide alarm. A household may also use the same battery format in smoke detectors, security sensors, or other emergency equipment, reducing the number of battery types it needs to inventory and replace.

Storage Guarantee for Spare Cells

A five-year storage guarantee gives buyers a defined expectation for cells held in reserve. Owners should still store the pack in a cool, dry place and follow the instructions supplied with their detector, especially when batteries will remain unused for long periods.

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4. Duracell Coppertop 9V Single – Best Single-Cell Replacement

4.7Editor scoreCheck price on Amazon

Duracell Coppertop 9V Single

One alkaline 9-volt cell

Five-year storage guarantee

CO detector compatible

Broad device application range

The Duracell Coppertop 9V Battery, 1 Count, is a focused replacement for someone who has identified the correct battery for one compatible detector. It holds a 4.7 rating and retains the useful specifications associated with the larger Coppertop 9V offering: compatibility with carbon monoxide detectors and a guaranteed five-year shelf life. The simple one-cell format makes it appropriate for immediate maintenance rather than building a large reserve.

Pros

• Ideal for one compatible detector
• High customer rating
• Guaranteed five-year storage
• Recognizable home-safety positioning

Cons

• No spare battery included
• Single purchase may require repeat ordering

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The product is designed for a broad range of safety and electrical devices, including smoke detectors, carbon monoxide detectors, alarm systems, and security sensors. That makes it useful even if a household owns more than one product that accepts a 9-volt battery. Its defined storage guarantee also provides confidence when the cell is bought ahead of a planned replacement.

Unlike a multipack, this option does not include an immediate spare. That can be inconvenient for owners of multiple compatible devices or for people who prefer to keep a replacement on hand. The storage guarantee should also be understood correctly: it describes how long the battery may be stored under the applicable terms, not how long it will power a detector after installation.

Choose this product when you need exactly one trusted replacement cell and already know that your carbon monoxide alarm uses a 9-volt battery. It is straightforward, well rated, and backed by a clear storage guarantee. For a household managing several alarms, the six-count version offers more operational convenience.

Simple and Precise Replacement

A single cell avoids unnecessary extras when a detector has just reached its replacement point. It can also serve as a temporary emergency spare, provided it remains within the manufacturer’s recommended storage conditions.

Reliability for Safety-Critical Use

Carbon monoxide alarms rely on uninterrupted power to communicate a hazard. The product’s 4.7 rating and stated use in carbon monoxide detectors make it a credible option for owners who prioritize a recognized battery brand and straightforward compatibility.

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5. First Alert Battery CO Alarm – Best Standalone Household Unit

4.6Editor scoreCheck price on Amazon

First Alert Battery CO Alarm

Battery-powered CO monitoring

Advanced electrochemical sensor

85-decibel audible alarm

End-of-life warning signal

The First Alert Battery Carbon Monoxide Alarm is a complete standalone unit for households seeking always-available carbon monoxide detection without a hardwired connection. Its 4.6 rating, battery-powered design, and stated ability to continue monitoring during a power failure make it a strong fit for a residence, rental, or additional protected area.

Pros

• Operates during power outages
• Clear audible hazard warning
• End-of-life replacement notification
• Five-year limited warranty

Cons

• Not a replacement battery product
• Requires separate battery purchases

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The alarm uses an advanced electrochemical carbon monoxide sensor and produces an 85-decibel warning when dangerous CO levels are detected. Its end-of-life signal chirp communicates when the unit itself should be replaced, an important distinction from a low-battery warning. The included information also notes a five-year limited warranty and testing against UL standards, providing useful context for buyers comparing safety equipment.

This is not a loose battery, and a buyer searching specifically for a 9-volt replacement will need one of the battery products elsewhere in this guide. The detector also requires regular testing, correct fresh-battery installation, and appropriate placement. The manufacturer recommends placing one on each level and in each bedroom for more complete coverage, which may mean purchasing multiple units.

This alarm is best for someone who needs a dedicated carbon monoxide detector rather than a replacement cell. Its battery operation, loud alarm, and end-of-life notification make it particularly appropriate for areas where continuous monitoring is important and hardwiring is inconvenient.

Outage-Resistant Monitoring

Because the unit is battery operated, it does not depend on the household electrical supply to remain active. That makes it useful during outages and in homes where a hardwired installation is not available.

Clear End-of-Life Notification

The end-of-life chirp helps distinguish the need to replace the entire alarm from a routine battery replacement. Owners should respond to the indicator according to the manual rather than attempting to keep an expired protective unit in service.

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6. First Alert Combination Alarm – Best Two-Hazard Protection

4.4Editor scoreCheck price on Amazon

First Alert Combination Alarm

Combined smoke and CO sensing

Precision Detection technology

Battery-operated installation

Test and silence button

The First Alert Battery Combination Smoke & Carbon Monoxide Alarm brings two forms of household protection into one unit. Its 4.4 rating is slightly lower than those of several standalone alternatives, but the combined design is valuable for households that want both smoke and carbon monoxide sensing without installing two separate devices. Battery operation keeps installation and maintenance straightforward.

Pros

• Combines smoke and CO protection
• Battery operation avoids hardwiring
• Test and silence controls
• End-of-life warning included

Cons

• Lower rating than leading picks
• May duplicate existing smoke alarms

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Precision Detection technology is designed to comply with updated industry standards while reducing cooking-related nuisance alarms. The unit also includes an end-of-life warning, a test and silence button, and two-in-one protection against smoke and carbon monoxide. These features make routine testing and maintenance more convenient for a device responsible for monitoring multiple hazards.

The main limitation is redundancy in homes that already have a well-placed network of smoke alarms. A combination unit may not be necessary in every room, and its single rating cannot be compared directly with dedicated products that address only one hazard. Buyers should also verify local guidance and the product instructions to establish appropriate placement for both types of detection.

This alarm is a good choice for households seeking one device to cover smoke and CO risks, especially where a separate carbon monoxide detector is not already installed. It offers the convenience of battery power and straightforward test controls while reducing the number of separate units needed in a suitable location.

Two Protection Types, One Unit

Combining smoke and carbon monoxide sensing can simplify protection in a space where both hazards are relevant. It may also reduce the number of separate alarms that need batteries, testing, and eventual replacement.

Designed for Routine Maintenance

A dedicated test and silence button helps owners verify operation and temporarily silence nuisance warnings where appropriate. The end-of-life warning adds another maintenance cue, although the manual should always be consulted before responding to any alert.

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7. Kidde Portable AA CO Alarm – Best Feature-Rich Portable Unit

4.7Editor scoreCheck price on Amazon

Kidde Portable AA CO Alarm

Two included AA batteries

Test and reset button

Low-battery chirp warning

Peak Level Memory

The Kidde Carbon Monoxide Detector with Test-Reset Button is a feature-rich portable alarm for users who want more control over testing and maintenance. It has a 4.7 rating, operates on two included AA batteries, and uses electrochemical sensor technology. The product can be mounted on a wall or set on a tabletop, extending its usefulness across homes, rentals, and travel spaces.

Pros

• Portable wall or tabletop use
• Useful test and silence control
• Low-battery warning included
• Peak Level Memory records events

Cons

• Warranty excludes battery performance
• Replacement timing requires checking

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Its most distinctive features are the Test-Hush button, low-battery chirp, and Peak Level Memory. The button allows users to test the detector or temporarily silence a low-battery warning. Peak Level Memory records the latest carbon monoxide detection or test event. The green and red LEDs supplement the 85-decibel alarm, giving users both visual and audible status information.

The stated ten-year limited manufacturer warranty applies to the alarm rather than the performance of its batteries, and the warranty period depends on when the unit was first powered on. If that date is unknown, the guidance says replacement should be assumed. Buyers also need to check the manual for current battery intervals because the age of the product may affect maintenance expectations.

This is the preferred portable detector for someone who values test controls, event memory, and explicit low-battery status. It is easy to place, operates during outages, and provides several ways to understand the unit’s condition. It is a complete alarm rather than a spare-battery pack, so additional AA cells will eventually be needed.

Test and Hush Controls

The built-in Test-Hush button gives users a convenient way to check the detector and quiet a temporary low-battery chirp. It simplifies regular maintenance without requiring buyers to improvise a testing method.

Peak Level Memory

Peak Level Memory provides a record of the most recent CO detection or test, offering useful context after an audible alarm. It can be especially helpful when household members need to determine whether the unit was recently triggered.

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8. First Alert Two-Pack CO Alarms – Best Multi-Level Coverage

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First Alert Two-Pack CO Alarms

Two battery-powered CO alarms

Electrochemical CO sensing

85-decibel audible warning

End-of-life chirp included

The First Alert Battery Carbon Monoxide Alarm sold in this listing includes two complete units, making it a convenient way to establish carbon monoxide coverage on more than one level. It carries a 4.6 rating and provides the same core features as a standard battery-powered alarm: electrochemical sensing, an 85-decibel warning, and continuous monitoring even during a power failure.

Pros

• Two complete alarms included
• Supports multi-level placement
• Continues monitoring during outages
• End-of-life notifications

Cons

• Two units may exceed household needs
• Batteries are not specified as included

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The multipack format is especially useful for homes with multiple floors, bedrooms, or other areas that warrant separate protection. The product information recommends placing one alarm on each level and in each bedroom for complete coverage. Two units are therefore not redundant when they occupy separate parts of the home, although the exact placement should be based on the manual and local safety guidance.

Each alarm includes an end-of-life signal chirp and is described as rigorously tested to meet UL standards. The listing also mentions a five-year limited warranty. Buyers should verify the package contents and battery requirements because the product information for this two-pack does not explicitly state that replacement batteries are included. Neither alarm can be tested meaningfully without a correctly installed compatible battery.

This two-pack is a strong choice for a home that needs multiple standalone carbon monoxide alarms. It reduces the need to source units separately and provides consistent sensing and alert features across the property. For a single location, one of the individual portable detectors may be more appropriate.

Consistent Coverage Across Levels

Two alarms allow a household to place units in separate locations rather than expecting one device to monitor an entire home. That is particularly relevant to the product guidance recommending protection on each level and in each bedroom.

Outage Protection in Both Units

Since the alarms are battery powered, they can continue monitoring when the electrical supply is interrupted. Buyers should still confirm the required battery format and establish a regular replacement and testing routine for each unit.

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9. EASTAR Alkaline 9V Two-Pack – Best Long-Storage Spare Pair

4.5Editor scoreCheck price on Amazon

EASTAR Alkaline 9V Two-Pack

Two alkaline 9-volt cells

Up to ten-year shelf life

Leak-proof battery design

Universal household compatibility

The EASTAR Alkaline 9V Two-Pack is a budget-conscious battery reserve for compatible carbon monoxide detectors and other household electronics. It has a 4.5 rating and advertises a shelf life of up to ten years under optimal storage conditions. The two-cell format is less substantial than the larger packs in this guide but still provides an installed battery and a useful spare.

Pros

• Long advertised storage life
• Two-cell replacement reserve
• Leak-proof construction
• Works with smoke and CO alarms

Cons

• Storage claim depends on conditions
• Does not include a detector

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The product emphasizes modern alkaline technology, stable output, and a leak-proof construction intended to preserve both the battery and the devices it powers. Its stated uses include smoke detectors, along with remote controls, game controllers, wireless keyboards, alarm clocks, radios, shavers, and electronic toys. That range makes it a flexible option for homes that already have several 9-volt-powered devices.

The long storage figure is the main reason to consider this pack, but it requires careful interpretation. The claim applies under optimal conditions, not every storage environment, and it does not mean each battery will power a carbon monoxide detector for ten years. Users must follow the alarm maker’s replacement instructions and use the battery type specified for their device.

This pair is best for someone who wants two compatible cells, including one emergency spare, and values a long advertised storage period. It is not a complete detector, so it works only after confirming that the existing alarm accepts a 9-volt alkaline battery. Its broad device compatibility also makes it a practical addition to a general household battery supply.

Long-Term Storage Positioning

An advertised shelf life of up to ten years makes the pack appealing for emergency reserves kept under controlled conditions. Keeping cells cool and dry helps preserve their useful life and reduces the likelihood of leakage during long storage.

More Than Safety-Device Power

The batteries are compatible with a wide range of household and office products. That versatility can be convenient for a user who wants to consolidate spare battery inventory, though safety alarms should always take priority for timely replacement.

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10. BlueDot Heavy-Duty 9V – Best Single Heavy-Duty Cell

4.2Editor scoreCheck price on Amazon

BlueDot Heavy-Duty 9V

One alkaline 9-volt cell

Five-year shelf life

CO detector compatibility

Non-rechargeable battery

The BlueDot Trading Heavy Duty 9 Volt Alkaline Battery is a single-cell replacement for compatible carbon monoxide detectors and several other safety devices. Its 4.2 rating is the lowest in the group, so it does not lead the recommendation rankings, but its specifications directly address the needs of users seeking a 9-volt power source for alarms, security equipment, and emergency devices.

Pros

• Designed for multiple alarm types
• Long advertised shelf life
• Broad device compatibility
• No added mercury

Cons

• Lowest rating in the selection
• Single cell offers no spare

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The battery has a stated five-year shelf life and a device list that includes smoke detectors, carbon monoxide detectors, emergency location transmitters, security devices, wireless doorbells, walkie-talkies, garage door openers, and wireless microphones. This broad compatibility is useful for people who want one familiar battery format across many household and light-duty equipment categories.

The quantity is a clear limitation for anyone who wants a spare or maintains more than one compatible alarm. The battery is also explicitly not rechargeable, so attempting to restore it through a charging system would be inappropriate. Packaging may vary, which is a minor inconvenience but should not affect the core battery specification.

This product is best for a one-time replacement in a compatible device or as a single emergency cell. Its lower rating means buyers with several compatible alarms may find the multipack options more convenient. Confirm the required battery type, observe the manufacturer’s replacement schedule, and store any unused cell under suitable conditions.

Purpose-Built Alarm Compatibility

The product information specifically names carbon monoxide detectors among the intended uses, along with smoke detectors and fire alarms. Buyers should still confirm the battery specification printed on or in their own detector before installation.

Single-Cell Convenience

A quantity of one is convenient when only one device needs service. It also allows a shopper to avoid acquiring a larger multipack, provided the household does not expect to keep several spare cells for future maintenance.

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Buying Guide – How to Choose the Best Batteries for Carbon Monoxide Detector

The right choice depends on whether you need a replacement cell or a complete alarm, followed by the detector’s required battery format, installation plan, and maintenance preferences.

Confirm the Required Battery Format

Carbon monoxide alarms are not universally powered by the same battery. Some use a 9-volt cell, while portable models may use two AA batteries. Read the battery compartment, model label, and user manual before selecting a replacement. Voltage, shape, chemistry, and polarity all matter, and an incorrect cell may not fit or may prevent the detector from operating correctly.

Decide Between Cells and Complete Alarms

A loose battery only maintains an existing detector, whereas a complete alarm provides sensing, audible warnings, status lights, and installation hardware. Shoppers searching without an existing device may prefer a complete unit, while those with a low-battery warning can focus on a compatible replacement cell. The distinction prevents buyers from purchasing a battery when they actually need monitoring equipment.

Review Shelf Life and Storage

Shelf life describes how long an unused battery may remain in storage under specified conditions. It is not the same as in-device service life, which depends on the detector, test frequency, environment, and battery chemistry. Owners keeping emergency spares should keep them cool, dry, and away from extreme conditions, and they should avoid treating a long storage claim as permission to ignore regular replacement reminders.

Count the Devices You Need to Power

A two-pack can cover one installed battery and one spare or two compatible alarms. A four- or six-count pack is more convenient for households with several devices or a recurring annual replacement routine. Counting compatible units before ordering helps prevent both an emergency shortage and the purchase of unnecessary extras.

Consider Leakage Resistance

Spare batteries may remain in storage for months or years, making leakage resistance an important feature. Products in this guide describe sealed or leak-resistant designs, but buyers should also store batteries properly and replace visibly damaged, corroded, or leaking cells. A protected package cannot guarantee perfect storage in a hot or damp environment.

Evaluate Alarm Status Features

Complete carbon monoxide detectors should provide an audible warning and ideally visual status indicators. Event memory, peak-level memory, low-battery warnings, end-of-life chirps, and test controls make maintenance easier. These features do not change the underlying battery requirement, but they help owners determine when to test, replace cells, or replace the entire alarm.

Plan Placement and Portability

A portable, battery-operated alarm can be mounted on a wall or placed on a tabletop, making it useful in rentals, guest rooms, travel spaces, and additional levels. Consider whether the product must remain in one location or move with the user. Placement should always follow the detector manual and applicable safety guidance.

Prioritize Testing and Maintenance

A fresh battery does not guarantee that an alarm is functioning or no longer near the end of its service life. Look for test buttons, end-of-life warnings, and clear instructions, then establish a routine for testing and replacing batteries. If a unit fails to alarm after a fresh battery is installed correctly, replace it rather than continuing to rely on it.

How to Use and Care for Your Batteries for Carbon Monoxide Detector

Begin by identifying the model and required battery format. Read the detector’s manual, remove any existing cells only after noting their orientation, and install the new battery or batteries according to the polarity markings. Avoid mixing battery types or manufacturers unless the alarm manufacturer explicitly permits it. A fresh cell restores power, but it does not reset the detector’s age or replace its end-of-life status.

Test the alarm after installation using the manufacturer’s test procedure. Confirm that the power indicator illuminates and that the audible test signal operates as expected. If the unit does not alarm, check that the battery is correctly installed and test again. If it still fails, replace the alarm immediately rather than assuming the new battery has resolved a deeper fault.

Maintain a simple schedule based on the manual and the low-battery or end-of-life indicators. Test the unit regularly, replace batteries on the specified interval, and keep spare cells in cool, dry storage. Also check the manufacture or power-on date of the detector when that information is available. An alarm of unknown age should be treated cautiously, because a new battery cannot extend the service life of an expired sensor or electronics package.

Frequently Asked Questions

Final Thoughts on Choosing the Best Batteries for Carbon Monoxide Detector

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