Best Batteries For Smart Locks

Richard Shafer | 21-01-2026

Smart locks and home security devices demand dependable power to keep your home protected around the clock. The wrong battery can mean frequent replacements, device malfunctions, or even lockouts—especially in extreme temperatures or during emergencies.

This guide reviews the top lithium batteries designed for smart locks, security cameras, and related tech. We break down the differences between AA, CR123A, and coin cell options, highlighting real-world strengths, tradeoffs, and which battery type best fits your needs.

Editor's Choice
Granicell 10-Pack Lithium AA Batteries
Granicell 10-Pack Lithium AA Batteries
Premium Pick
Enegitech AA Lithium Battery 3000mAh
Enegitech AA Lithium Battery 3000mAh
Budget Pick
Duracell 2032 Lithium Battery 4-Pack
Duracell 2032 Lithium Battery 4-Pack

Top 10 Best Batteries For Smart Locks

After reviewing and comparing the most popular Batteries For Smart Locks options, we identified the products that offer the best balance of quality, performance, and value.

1. Granicell 10-Pack Lithium AA Batteries

Best for Extreme Temperatures
Granicell 10-Pack Lithium AA Batteries
9.8

Granicell

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Powering smart locks and security devices reliably is crucial for home safety, especially in harsh weather or high-drain scenarios. Lithium AA batteries like these are engineered to deliver consistent energy where alkaline options often fail.

Granicell’s 10-pack stands out for its robust performance in both freezing and scorching conditions, making it a strong choice for outdoor smart locks or cameras. Homeowners who want to minimize battery changes and avoid device failures in extreme climates will appreciate this pack.

  • 10-year shelf life ensures batteries are ready when needed, reducing waste and emergency runs.
  • Triple-layer leak protection safeguards devices from corrosion or damage, even with heavy use.
  • Wide compatibility supports both high-drain tech and everyday gadgets, adding flexibility across your home.

Compared to standard alkaline batteries, this pack prioritizes longevity and safety in tough environments. The main tradeoff is a higher upfront cost, but it pays off with fewer replacements and less hassle.

Strength
  • Performs in extreme temperatures
  • Long 10-year shelf life
  • Triple-layer leak protection
  • Versatile for many devices
  • Lifetime warranty
Weakness
  • Higher initial cost
  • Not rechargeable

2. Enegitech AA Lithium Battery 3000mAh

Best Eco-Friendly Materials
Enegitech AA Lithium Battery 3000mAh
9.5

Enegitech

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Frequent battery changes in smart locks can be inconvenient and create unnecessary waste. Choosing a high-capacity, environmentally conscious option helps reduce both hassle and environmental impact.

Enegitech’s AA lithium batteries offer a balance of long-lasting power and eco-friendly design. They’re ideal for buyers who want reliable performance in smart locks, security cameras, and other home devices without worrying about harmful materials.

  • 3000mAh capacity delivers extended runtime for high-drain electronics, minimizing replacements.
  • Leak-proof construction protects devices from damage, even after full discharge.
  • Mercury, cadmium, and lead-free design reduces environmental footprint and disposal concerns.

Compared to typical alkaline batteries, these prioritize sustainability and safety. The tradeoff is that they are non-rechargeable, so proper disposal is still important.

Strength
  • High 3000mAh capacity
  • Performs in extreme temperatures
  • Eco-friendly materials
  • Long storage life
  • Leak-proof design
Weakness
  • Non-rechargeable
  • Not for all device types

3. Amazon Basics CR123A Lithium Batteries 6-Pack

Best Value for CR123A Devices
Amazon Basics CR123A Lithium Batteries 6-Pack
8.7

Amazon Basics

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Certain smart locks and security sensors require CR123A batteries, which can be costly and hard to source. A reliable, affordable pack ensures your devices stay powered without frequent trips to the store.

Amazon Basics’ CR123A 6-pack is a practical choice for buyers needing dependable power for compatible smart locks, sensors, or flashlights. It’s best for those who want a budget-friendly option for less common battery types.

  • 1,550mAh capacity supports steady operation in high-drain devices.
  • 10-year leak-free shelf life means you can stock up and store extras with confidence.
  • Six-pack format provides value and convenience for multi-device households.

Compared to premium brands, this pack focuses on affordability and shelf life. The main tradeoff is that it’s not recommended for Arlo cameras and is single-use only.

Strength
  • Affordable multi-pack
  • Long shelf life
  • Leak-free design
  • Good for emergency storage
Weakness
  • Not rechargeable
  • Not for all brands

4. Duracell 2032 Lithium Battery 4-Pack

Best Child-Safe Coin Cell
Duracell 2032 Lithium Battery 4-Pack
8.9

Duracell

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Coin cell batteries are essential for compact smart locks and key fobs, but safety is a major concern in homes with children. Accidental ingestion can be dangerous, so protective features are critical.

Duracell’s 2032 lithium batteries are designed with a bitter coating and child-secure packaging, making them a top pick for families. They’re ideal for smart locks, trackers, and remotes where safety and reliability are non-negotiable.

  • Bitter coating helps deter accidental swallowing, adding peace of mind.
  • Child-secure packaging is difficult to open without scissors, reducing risk at home.
  • 10-year storage guarantee ensures batteries are ready for use when needed.

Compared to generic coin cells, these prioritize child safety and long-term dependability. The tradeoff is a slightly higher price per battery.

Strength
  • Child-safe packaging
  • Bitter coating for safety
  • Long shelf life
  • Trusted brand
Weakness
  • Higher cost per cell
  • Limited to coin cell devices

5. Granicell 16-Pack Lithium AA Batteries

Best Bulk Pack for Families
Granicell 16-Pack Lithium AA Batteries
8.7

Granicell

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Managing multiple smart locks and home devices means you’ll go through batteries quickly. Buying in bulk can save money and ensure you’re always prepared for replacements.

Granicell’s 16-pack offers the same long-lasting, extreme-temperature performance as their smaller packs but in a larger quantity. It’s a smart choice for families or anyone with several security devices to maintain.

  • 16-pack bulk size reduces cost per battery and ensures you have spares on hand.
  • Triple-layer leak protection keeps devices safe from corrosion and damage.
  • Wide compatibility fits smart locks, cameras, and everyday gadgets.

Compared to smaller packs, this option prioritizes convenience and value for households with many devices. The main tradeoff is a higher upfront investment.

Strength
  • Large pack size
  • Long-lasting lithium power
  • Leak protection
  • Works in many devices
Weakness
  • Higher initial spend
  • Not rechargeable

6. Enegitech AA Lithium Battery 1.5V

Best Lightweight AA Option
Enegitech AA Lithium Battery 1.5V
8.5

Enegitech

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For portable smart locks or devices where weight matters, a lighter battery can make installation and use easier. Lithium AAs are also preferred for their steady voltage output.

Enegitech’s AA lithium batteries are notably lighter than alkaline alternatives, making them suitable for compact or portable devices. They’re a good fit for users who want long-lasting, reliable power without adding bulk.

  • Lightweight design makes handling and installation easier, especially in portable devices.
  • 3000mAh capacity offers extended service life for high-drain electronics.
  • Performs in extreme temperatures ensures reliability outdoors or in varying climates.

Compared to standard AAs, these prioritize weight reduction and voltage stability. The tradeoff is a slightly higher price and non-rechargeable format.

Strength
  • Lighter than alkaline batteries
  • Long-lasting power
  • Stable voltage output
  • Works in cold and heat
Weakness
  • Not rechargeable
  • Premium price

7. Enegitech CR123A 3V Lithium Battery

Best Safety Features for CR123A
Enegitech CR123A 3V Lithium Battery
8.3

Enegitech

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Smart locks and sensors using CR123A batteries need both reliable power and built-in safety protections. Overheating or short circuits can damage devices or pose risks.

Enegitech’s CR123A lithium batteries include advanced safety features, making them a solid pick for users who prioritize device protection. They’re best for smart locks, alarms, and sensors requiring CR123A cells.

  • PTC protection guards against pressure, temperature, and current surges for safer operation.
  • 10-year standby power ensures readiness for infrequently used devices.
  • Wide compatibility fits a range of home security and sensor devices.

Compared to basic CR123A batteries, these focus on safety and long-term reliability. The tradeoff is that they are single-use and should not be recharged.

Strength
  • Advanced safety features
  • Long standby life
  • Compatible with many devices
  • Good for emergency use
Weakness
  • Disposable only
  • Not for rechargeable devices

8. EBL Lithium AA Batteries 12-Pack

Best for Long-Term Storage
EBL Lithium AA Batteries 12-Pack

If you want to keep a supply of batteries ready for emergencies or infrequent use, shelf life is critical. Some lithium batteries can lose charge over time, making them unreliable when finally needed.

EBL’s 12-pack offers an impressive 25-year shelf life, making it ideal for long-term storage or backup power for smart locks and home devices. It’s best for users who want peace of mind that their batteries will work even after years in storage.

  • 25-year shelf life means batteries retain power for decades, ideal for emergency kits.
  • 3700mAh capacity provides extended runtime for demanding devices.
  • Leak-proof construction protects devices from damage during storage.

Compared to standard lithium AAs, these prioritize longevity and backup readiness. The tradeoff is a higher price per battery and non-rechargeable design.

Strength
  • Extremely long shelf life
  • High 3700mAh capacity
  • Leak-proof build
  • Good for emergency storage
Weakness
  • Higher price per battery
  • Not rechargeable

9. BEVIGOR Lithium AA Batteries 12-Pack

Best for Cold Weather Use
BEVIGOR Lithium AA Batteries 12-Pack
7.9

Bevigor

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Cold weather can quickly drain standard batteries, leading to unreliable smart locks or security devices. Choosing a battery designed for low temperatures ensures consistent performance year-round.

BEVIGOR’s AA lithium batteries are engineered for superior cold resistance, making them a good choice for outdoor smart locks, cameras, or sensors exposed to winter conditions. They’re suited for users who need reliable power in challenging environments.

  • Cold-resistant design operates from -40°F to 140°F, ensuring year-round reliability.
  • Three-layer leak-proof safety protects devices from corrosion and damage.
  • 20-year lifespan means fewer replacements and less maintenance.

Compared to regular AA batteries, these focus on cold weather performance and safety. The tradeoff is that they are non-rechargeable and best suited for high-drain devices.

Strength
  • Excellent cold resistance
  • Long 20-year lifespan
  • Leak-proof safety design
  • Versatile for many devices
Weakness
  • Single-use only
  • Not for rechargeable needs

9. BEVIGOR Lithium AA Batteries 12-Pack

Best for Cold Weather Use
BEVIGOR Lithium AA Batteries 12-Pack
7.9

Bevigor

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Cold weather can quickly drain standard batteries, leading to unreliable smart locks or security devices. Choosing a battery designed for low temperatures ensures consistent performance year-round.

BEVIGOR’s AA lithium batteries are engineered for superior cold resistance, making them a good choice for outdoor smart locks, cameras, or sensors exposed to winter conditions. They’re suited for users who need reliable power in challenging environments.

  • Cold-resistant design operates from -40°F to 140°F, ensuring year-round reliability.
  • Three-layer leak-proof safety protects devices from corrosion and damage.
  • 20-year lifespan means fewer replacements and less maintenance.

Compared to regular AA batteries, these focus on cold weather performance and safety. The tradeoff is that they are non-rechargeable and best suited for high-drain devices.

Strength
  • Excellent cold resistance
  • Long 20-year lifespan
  • Leak-proof safety design
  • Versatile for many devices
Weakness
  • Single-use only
  • Not for rechargeable needs

Buying Guide: How to Choose the Best Batteries for Smart Locks

Choosing the right batteries for smart locks and security devices involves more than just picking the correct size. Battery chemistry, shelf life, safety features, and compatibility all play a role in ensuring your home remains secure and hassle-free. Many buyers underestimate the impact of temperature, device requirements, and bulk purchasing on long-term reliability and cost.

Choosing Between AA, CR123A, and Coin Cell Batteries

Smart locks and security devices are not one-size-fits-all when it comes to batteries. AA lithium batteries are the most common for mainstream smart locks and cameras, offering long life and easy sourcing. CR123A batteries are required for certain sensors and high-performance devices, while coin cells power compact locks and key fobs. Always match the battery type to your device’s specifications to avoid malfunctions.

Shelf Life and Storage Considerations

If you want to keep spare batteries on hand for emergencies or infrequent use, shelf life is a key factor. Some lithium batteries, like the EBL 12-pack, offer up to 25 years of reliable storage, making them ideal for backup kits. Others provide 10-year guarantees, which is sufficient for most households. Consider how often you’ll use or replace batteries before buying in bulk.

Safety Features: Leak Protection and Child Safety

Device safety and household safety are both important. Advanced leak-proof designs protect your smart locks from corrosion, while coin cell batteries with bitter coatings and child-secure packaging reduce risks in homes with children. Prioritize these features if you have high-value devices or young family members.

Environmental Impact and Disposal

Eco-conscious buyers should look for batteries free from heavy metals like mercury, cadmium, and lead. While most lithium batteries are single-use, choosing environmentally friendly options and disposing of them properly helps minimize your footprint.

Bulk Buying vs. Individual Packs

For homes with multiple smart locks or security devices, buying in bulk can save money and ensure you always have replacements on hand. However, if you only have one or two devices, smaller packs may be more cost-effective and reduce waste from expired batteries.

Final Buying Advice

Selecting the right battery for your smart lock is about balancing device compatibility, reliability, and safety. Consider your climate, household needs, and how many devices you maintain before making a purchase.

FAQ For Batteries For Smart Locks

1. What type of battery do most smart locks use?

Most smart locks use AA lithium batteries, but some models require CR123A or coin cell batteries. Always check your device’s specifications.

2. How long do lithium batteries last in smart locks?

Lithium batteries can last from several months to over a year in smart locks, depending on usage, device type, and environmental conditions.

3. Are lithium batteries safe to use in outdoor smart locks?

Yes, lithium batteries are designed to perform in extreme temperatures and are generally safe for outdoor use, especially models with leak protection.

4. Can I use rechargeable batteries in my smart lock?

Most smart locks are optimized for non-rechargeable lithium batteries. Using rechargeable batteries may affect performance or void warranties.

5. What should I do with used lithium batteries?

Dispose of used lithium batteries at a designated recycling center. Do not throw them in regular household trash.

6. How important is shelf life for smart lock batteries?

Shelf life is important if you store spare batteries for emergencies or infrequent use. Longer shelf life ensures batteries work when needed.

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