6 Best Replacement Batteries for Smart Locks in 2026

Finding the best replacement batteries for smart locks involves balancing longevity, reliability, and cost. The 12000mAh Rechargeable Battery for eufy Security Smart Locks stands out for its impressive capacity, reducing the need for frequent replacements. For those seeking affordability, the BEVIGOR AA Lithium Batteries 48-Pack offers reliable performance at a lower price point. Meanwhile, the Philips 3V Lithium CR2032 Coin Cells excel for compact, low-power locks. The main tradeoffs include balancing upfront cost versus long-term performance and choosing between rechargeable and disposable options. Continue reading for a detailed breakdown of these choices and which one fits your needs best.

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Key Takeaways

• Rechargeable batteries like the 12000mAh model are ideal for heavy use, reducing ongoing costs but require initial investment.
• Lithium batteries generally outperform alkaline options in longevity and reliability, especially in cold environments.
• Coin cell batteries are best suited for low-power, compact locks but need more frequent replacement for high-use locks.
• Bulk packs offer savings but may include batteries that aren’t optimized for smart lock performance; quality matters more than quantity.
• Tradeoffs often involve balancing upfront cost against long-term durability, with premium options offering better reliability over time.

Our Top Best Replacement Batteries For Smart Locks Picks

12000mAh Rechargeable Battery for eufy Security Smart Locks and Smart Drop		Best Overall for Long-Term Convenience	Voltage: 3.7V	Capacity: 12000mAh	Wh: 44.4Wh	VIEW LATEST PRICE	See Our Full Breakdown
BEVIGOR AA Lithium Batteries 48-Pack, 3500mAh, 1.5V, Double A, Non-Rechargeable		Best for High-Drain Devices with Long Runtime	Capacity: 3500mAh	Voltage: 1.5V	Quantity: 48 pack	VIEW LATEST PRICE	See Our Full Breakdown
Enegitech AA Lithium Battery, 3000mAh, 1.5V, 16 Pack		Best for Long Shelf Life and Extreme Conditions	Battery Type: Lithium AA	Voltage: 1.5V	Capacity: 3000mAh	VIEW LATEST PRICE	See Our Full Breakdown
Philips 3V Lithium CR2032 Coin Cell Batteries – 5 Pack		Best for Small Electronics and Long Storage	Voltage: 3V	Quantity: 5 batteries	Storage Life: 10 years	VIEW LATEST PRICE	See Our Full Breakdown
Enegitech AA Lithium Battery, 1.5V, 24 Pack		Best for High-Performance, Extreme Conditions	Battery Type: AA Non-rechargeable Lithium	Voltage: 1.5V	Capacity: 3000mAh	VIEW LATEST PRICE	See Our Full Breakdown
BEVIGOR 1.5V Long-Lasting Lithium AA Batteries (16 Pack)		Best Long-Term Storage and Emergency Use	Voltage: 1.5V	Quantity: 16 pack	Shelf Life: 20 years	VIEW LATEST PRICE	See Our Full Breakdown

More Details on Our Top Picks

1. 12000mAh Rechargeable Battery for eufy Security Smart Locks and Smart Drop

   

   Best Overall for Long-Term Convenience

   View Latest Price

   This rechargeable battery stands out for its high capacity of 12000mAh, offering extended power for eufy security smart locks without frequent replacements. Unlike the single-use lithium options like BEVIGOR AA Lithium Batteries 48-Pack, this model allows for repeated recharging, reducing long-term costs and waste. Its compatibility with multiple eufy devices and built-in circuit protections make it a reliable choice for households seeking hassle-free power. However, it requires a USB charging cable and isn’t designed to report cycle life or longevity, which could be a concern for heavy users.

   This pick makes the most sense for homeowners who prioritize convenience and long-term savings over initial investment, especially if they already have compatible eufy systems.

   Pros:

   • High capacity for extended use between charges
   • Rechargeable, reducing ongoing costs
   • Easy to install without removing the lock
   • Built-in circuit protections for safety

   Cons:

   • Requires USB charging cable for recharging
   • Limited to compatible eufy models

   Best for: Families or individuals using eufy smart locks who want a rechargeable, maintenance-free power source

   Not ideal for: Users with incompatible or non-eufy smart locks, or those preferring disposable batteries for simplicity

   • Voltage:3.7V
   • Capacity:12000mAh
   • Wh:44.4Wh
   • Temperature Range:-30℃ to 70℃
   • Input:5V/2A
   • Package Contents:Battery, USB charging cable
   • Warranty:1 year
   Our verdict

   “This rechargeable option is perfect for users seeking long-term savings and minimal maintenance in compatible eufy smart lock systems.”

   → See it on Amazon →

2. BEVIGOR AA Lithium Batteries 48-Pack, 3500mAh, 1.5V, Double A, Non-Rechargeable

   

   Best for High-Drain Devices with Long Runtime

   View Latest Price

   Compared with rechargeable options like the 12000mAh eufy battery, these lithium AA batteries deliver a substantial 3500mAh capacity per cell, making them ideal for high-drain smart locks and security gadgets that need reliable power over time. They outperform alkaline batteries in extreme temperatures and are leakproof, providing peace of mind in outdoor or challenging environments. The main tradeoff is their non-rechargeable nature, meaning ongoing replacement costs can add up, especially if used in multiple devices.

   This makes them suitable for users who prefer a set-it-and-forget-it approach, especially in outdoor or remote locations where battery failure is not an option.

   Pros:

   • Longer runtime than standard alkaline batteries
   • Leakproof and safe for devices
   • Excellent performance in extreme temperatures
   • Ideal for high-drain applications

   Cons:

   • Non-rechargeable, requiring frequent replacements
   • Higher upfront cost compared to alkalines

   Best for: Homeowners or security professionals needing dependable, high-capacity batteries for high-drain smart lock systems

   Not ideal for: Users seeking rechargeable batteries or those with low usage frequency, as replacement costs may become prohibitive

   • Capacity:3500mAh
   • Voltage:1.5V
   • Quantity:48 pack
   • Type:Lithium AA
   • Leakproof:Yes
   • Temperature Range:-40°F to 140°F
   Our verdict

   “These lithium AA batteries are excellent for high-drain, outdoor, or emergency security setups where long-lasting power outweighs the need for reusability.”

   → See it on Amazon →

3. Enegitech AA Lithium Battery, 3000mAh, 1.5V, 16 Pack

   

   Best for Long Shelf Life and Extreme Conditions

   View Latest Price

   This pack of Enegitech lithium AA batteries offers a reliable 3000mAh capacity, perfect for smart locks, sensors, and security cameras that require stable power in challenging environments. Unlike the larger capacity BEVIGOR batteries, these are smaller packs suited for users who want dependable performance without bulk. Their 10-year shelf life and leak-proof design make them excellent for infrequent replacements or emergency supplies. The downside is their non-rechargeable format, which might be inconvenient for heavy users needing frequent changes.

   This option is ideal for those who prioritize long-term storage and high-temperature resilience over rechargeable convenience.

   Pros:

   • Long shelf life of up to 10 years
   • Leak-proof and safe for high-tech devices
   • Reliable in extreme temperatures
   • Compact and lightweight

   Cons:

   • Non-rechargeable, requiring replacement
   • Limited to infrequent use scenarios

   Best for: Home security setups where batteries are stored for long periods and used infrequently

   Not ideal for: High-usage environments where frequent replacements are impractical or costly

   • Battery Type:Lithium AA
   • Voltage:1.5V
   • Capacity:3000mAh
   • Quantity:16 pack
   • Rechargeable:No
   • Shelf Life:10 years
   Our verdict

   “This battery is best for long-term storage and backup in smart security systems, not for continuous high-drain use.”

   → See it on Amazon →

4. Philips 3V Lithium CR2032 Coin Cell Batteries – 5 Pack

   

   Best for Small Electronics and Long Storage

   View Latest Price

   The Philips CR2032 coin cells provide reliable power for small electronic devices, including sensors and remote controls for smart locks. Their long 10-year storage life makes them excellent for infrequent use or emergency supplies. Compared to larger AA or lithium batteries, these tiny cells are designed for specific applications, with the benefit of universal compatibility across many household gadgets. The main limitation is their small size and lower capacity, which means they need replacement sooner in high-drain devices.

   This choice suits users who need dependable backup batteries for small components rather than powering entire lock systems.

   Pros:

   • Long shelf life of up to 10 years
   • Safe, leak-proof, child-resistant packaging
   • Reliable in various climates
   • Universal compatibility with many small devices

   Cons:

   • Limited to devices using CR2032 batteries
   • Needs frequent replacement in high-drain applications

   Best for: Users needing long-lasting backup power for small devices in smart lock ecosystems

   Not ideal for: High-drain, high-power devices or main power sources for locks requiring larger batteries

   • Voltage:3V
   • Quantity:5 batteries
   • Storage Life:10 years
   • Temperature Range:-4°F to 140°F
   • Child-Resistant:Yes
   Our verdict

   “These coin cell batteries are perfect for backup or low-power components in smart lock setups where longevity is valued over high capacity.”

   → See it on Amazon →

5. Enegitech AA Lithium Battery, 1.5V, 24 Pack

   

   Best for High-Performance, Extreme Conditions

   View Latest Price

   This Enegitech AA lithium battery offers a 3000mAh capacity, matching the BEVIGOR AA lithium batteries, but in a smaller pack size of 24. Its performance in extreme temperatures (-40°C to +60°C) and lighter weight than alkaline batteries make it ideal for high-tech devices like smart locks, cameras, and flashlights that need dependable power in demanding environments. The main drawback is its non-rechargeable nature, which could lead to higher ongoing costs if used in high-frequency replacement scenarios. Still, for long-term outdoor applications, its reliability is unmatched.

   This is a smart choice for users who need durable, high-capacity batteries for outdoor or mobile security devices.

   Pros:

   • Long-lasting 3000mAh capacity
   • Operates in extreme temperatures
   • Lighter than alkaline batteries
   • Reliable high-drain performance

   Cons:

   • Non-rechargeable, necessitating replacement
   • More costly upfront than alkalines

   Best for: Outdoor security systems or mobile setups where durability and temperature resilience are priorities

   Not ideal for: Indoor or low-drain applications where rechargeable or alkaline batteries suffice

   • Battery Type:AA Non-rechargeable Lithium
   • Voltage:1.5V
   • Capacity:3000mAh
   • Pack Size:24
   Our verdict

   “This lithium AA battery is suited for demanding outdoor or mobile security setups where resilience and longevity are essential, despite the cost of single-use batteries.”

   → See it on Amazon →

6. BEVIGOR 1.5V Long-Lasting Lithium AA Batteries (16 Pack)

   

   Best Long-Term Storage and Emergency Use

   View Latest Price

   This pack of 16 lithium AA batteries from BEVIGOR stands out for its impressive 20-year shelf life, making it an excellent choice for emergency preparedness and backup power. Unlike standard alkaline batteries, these provide consistent voltage over extended periods, which can be especially beneficial for smart locks that require reliable power during outages. Compared to the 48-pack of BEVIGOR’s alkaline batteries, this lithium option offers superior longevity and temperature tolerance, but at a higher cost that might not appeal to budget-conscious buyers. Their safety features, such as leak-proof and short-circuit protections, reduce the risk of damage or corrosion in storage or during use. However, performance can fluctuate depending on device and environmental conditions, and their price premium might be a barrier for some users. This pick makes the most sense for those who prioritize long-term storage and emergency readiness over initial cost, particularly in outdoor or extreme climates.

   Pros:

   • 20-year shelf life ensures long-term readiness
   • Wide temperature tolerance (-40°F to 140°F) suitable for outdoor use
   • Leak-proof and short-circuit protection enhances safety and device longevity
   • Consistent voltage output ideal for sensitive electronics

   Cons:

   • Higher cost compared to standard alkaline batteries
   • Performance may vary depending on device and environmental factors

   Best for: Homeowners seeking reliable, long-term backup batteries for smart locks used in outdoor or variable-temperature environments

   Not ideal for: Casual users who only need batteries for occasional lock use and want low-cost options

   • Voltage:1.5V
   • Quantity:16 pack
   • Shelf Life:20 years
   • Temperature Range:-40°F to 140°F
   • Protection Features:Leak-proof, explosion-proof valve, short-circuit protection
   • Intended Use:High-end electronics, emergency backup, outdoor devices
   Our verdict

   “This battery set is best for users who want peace of mind with long-term storage and outdoor durability, despite the higher price.”

   → See it on Amazon →

How We Picked

I evaluated these batteries based on key factors that directly impact smart lock performance: capacity, longevity, compatibility, cost-effectiveness, and ease of installation. Rechargeable options are assessed for their long-term savings, while disposable lithium batteries are judged on their reliability and shelf life. The ranking reflects a combination of user experience, brand reputation, and performance under typical smart lock conditions. Batteries that provide consistent power, resist temperature fluctuations, and are compatible with most smart lock models earned higher positions. Ultimately, I aimed to highlight options suited for different user priorities—whether cost, convenience, or durability.

Factors to Consider When Choosing Best Replacement Batteries For Smart Locks

Choosing the right replacement batteries for your smart lock goes beyond just picking the most popular brand. Several factors influence how well a battery will perform and how often you’ll need to replace it. Considering aspects like capacity, type, and compatibility can save you money and prevent lock failures. Being aware of common pitfalls, such as using incompatible batteries or overlooking climate considerations, helps ensure your smart lock remains secure and functional.

Battery Type and Chemistry

Understanding the difference between alkaline, lithium, and rechargeable batteries is key. Lithium batteries generally offer better performance in cold conditions and have a longer shelf life, making them ideal for smart locks that require consistent power. Rechargeable batteries, while more expensive initially, can be more cost-effective over time, especially if you frequently change batteries. Alkaline options are affordable but tend to drain faster and may not perform well in extreme temperatures.

Capacity and Runtime

A higher capacity, measured in mAh, usually translates to longer intervals between replacements. For smart locks that see high daily use, selecting batteries with higher capacity can reduce maintenance. However, extremely high-capacity batteries may come with increased cost or size, so balance capacity with your lock’s size and power needs. Always check your lock’s power requirements to ensure compatibility.

Compatibility and Size

Not all batteries fit every smart lock. Coin cells like the CR2032 are suitable for compact locks with low power draw, but larger batteries are needed for high-drain locks. Knowing your lock’s battery compartment size and voltage requirements prevents purchasing incompatible batteries that won’t work or could damage your device. Consult your lock’s manual for precise specifications.

Cost and Long-Term Value

While cheaper batteries may seem attractive initially, their shorter lifespan could lead to more frequent replacements and higher costs over time. Investing in higher-quality lithium or rechargeable options can pay off by reducing the total number of replacements and maintenance efforts. Consider your usage pattern and budget to decide whether immediate savings outweigh long-term value.

Climate and Storage Considerations

Extreme temperatures can impact battery performance and lifespan. Lithium batteries tend to perform better in cold environments than alkaline ones. Proper storage—keeping batteries in a cool, dry place—also extends their shelf life. If you live in an area with harsh weather, prioritize batteries known for resilience in such conditions to ensure your smart lock remains powered reliably.

Frequently Asked Questions

Should I use rechargeable or disposable batteries for my smart lock?

Choosing between rechargeable and disposable batteries depends on your usage habits and budget. Rechargeable batteries can save money over time and reduce waste, making them ideal for frequent replacements. However, they typically require a charger and may have slightly lower voltage initially. Disposable lithium batteries, while more expensive upfront, offer consistent performance and longer shelf life, which is beneficial if you prefer a set-and-forget approach. Consider your convenience preferences and how often you replace batteries to make the best choice.

How often do I need to replace batteries in my smart lock?

The replacement frequency varies based on battery type, usage, and environmental conditions. High-capacity lithium batteries can last several months up to a year in typical smart lock use, while alkaline batteries might need replacement every few months. If your lock signals low power early or you notice sluggish operation, it’s a sign to replace the batteries sooner. Regularly checking your lock’s battery status can help avoid unexpected lockouts or failures.

Can I use standard AA batteries for my smart lock?

Many smart locks are compatible with standard AA batteries, especially alkaline or lithium types, but it’s essential to verify the voltage and size specifications in your lock’s manual. Using the wrong type or size can cause performance issues or damage. Lithium AA batteries often outperform alkaline ones in longevity and cold-weather performance, making them a better choice for critical security devices like smart locks.

Are rechargeable batteries safe for outdoor smart locks?

Rechargeable batteries, especially lithium-ion types, are generally safe for outdoor use if they are high-quality and designed for such conditions. Ensure you use batteries from reputable brands to avoid leakage or failure. Proper charging and storage are important to prevent damage. Many rechargeable options are weather-resistant, but always check the specifications to confirm suitability for outdoor environments and your lock’s requirements.

What’s the best way to store spare batteries for my smart lock?

Batteries should be stored in a cool, dry place away from direct sunlight and extreme temperatures to preserve their lifespan. Keep them in their original packaging or a dedicated container to prevent accidental discharge or damage. Avoid storing batteries near metal objects that could cause short circuits. Regularly check stored batteries for signs of leakage or corrosion before use, especially if stored for extended periods.

Conclusion

For most users, the 12000mAh Rechargeable Battery for eufy Security Smart Locks offers the best overall performance, combining high capacity and convenience. Budget-conscious buyers will appreciate the reliability of the BEVIGOR AA Lithium Batteries 48-Pack for long-term use. If you prefer a premium, maintenance-free option, high-quality lithium coin cells like the Philips CR2032 are excellent for low-power, compact locks. Beginners or casual users should prioritize ease of installation and cost, while those in colder climates or with high daily use should look for batteries designed for durability and temperature resistance. Tailor your choice based on how often you replace batteries, your environmental conditions, and your budget to keep your smart lock functioning smoothly.