A smart lock can fail at the worst moment, especially with children waiting at the door or a package exposed outside. You need a cell that matches the lock’s specified type and dimensions, delivers steady 3V power, and remains usable in storage. This guide covers coin cells for compact locks, lithium AA rechargeables for high-drain models, and larger cylindrical options for devices that call for them.
The Picks In Brief
PHILIPS CR2016 Lithium Coin Cell Batteries, 5 Count, 3V
PHILIPS CR2032 Lithium Coin Cell Batteries, 5 Count, 3V
PHILIPS CR2450 Lithium Coin Cell Batteries, 5 Count, 3V
PHILIPS CR2025 Lithium Coin Cell Batteries, 5 Count, 3V
PHILIPS CR2430 Lithium Coin Cell Batteries, 5 Count, 3V
PHILIPS Rechargeable AA Lithium Batteries, 8 Pack, 1.5V, 3600mWh
Home4me CR123A Lithium Batteries, 3V, 1650mAh, 16 Pack
More Details On Our Top Picks
The CR2016 format suits slim smart locks whose battery compartment accepts this specific coin cell. Its lithium chemistry supports low self-discharge during storage, which matters for spare cells kept in a drawer until a lock needs them.
Five cells give you useful replacement coverage without creating a large maintenance stockpile. For most homes, the fit is straightforward, provided your lock manual specifies CR2016 rather than a similar diameter.
The Value In It
- The stated 10-year storage life supports long-term backup planning.
- Leak-resistant construction helps protect a sensitive lock compartment.
- Child-resistant packaging adds an important storage precaution.
- A five-count pack covers immediate use plus several future changes.
Practical Considerations
- Diameter and thickness must match a CR2016 requirement exactly.
- Store unused cells separately from loose metal objects and keep packaging intact until needed.
Feature Snapshot
Made For
You benefit most from this pack when your smart-lock manual specifies a CR2016 cell and you keep spare lithium batteries indoors.
Consider Something Else When
PHILIPS CR2032 Lithium Coin Cell Batteries fit smart locks that require the wider CR2032 format instead.
Compared with the narrower CR2016 pick, the CR2032 offers a broader coin-cell format for locks designed around that specification. You still need to check diameter, thickness, and quantity before ordering because a close visual match does not confirm electrical compatibility.
This pack works well for households maintaining several compatible devices, from smart locks to remotes. The stated storage characteristics make it more practical for a mixed battery drawer than constantly replacing short-lived cells.
What Stands Out
- The 3V lithium format matches many common smart-lock battery compartments.
- A five-count pack covers routine household maintenance.
- Long storage characteristics suit backup cells kept indoors.
- Leak-resistant construction helps preserve nearby electronics.
- Child-resistant packaging discourages casual access.
Details To Watch
- CR2032 cells will not fit a compartment designed specifically for CR2016 dimensions.
- Expected service life varies with lock activity, temperature, and battery age.
Right Fit For
This option suits you when your lock lists CR2032 cells and your household also uses that size in compatible remotes or small electronics.
A Better Fit Elsewhere
PHILIPS CR2025 Lithium Coin Cell Batteries offer a different thickness for locks that specifically require the CR2025 format.
The CR2450 is the broadest coin-cell format in this group, making it relevant only to smart locks with a suitably sized compartment. That larger body can suit devices with more internal room, but it cannot replace the smaller CR2032 or CR2025 merely because all three deliver 3V.
For a front-door lock used daily, the stated voltage consistency and long storage life make this a sensible reserve. You gain less from the five-pack in a home with only one CR2450 device, though.
Why It Works Well
- The wide CR2450 body fits compatible locks with sufficient compartment clearance.
- Stable 3V output supports electronics expecting lithium coin-cell power.
- Five cells give multiple-device or future-replacement coverage.
- Leak-resistant packaging construction helps protect the battery compartment.
Trade Offs
- Its larger dimensions rule it out for most CR2032 and CR2025 locks.
- Five cells may be excessive for a home with only one compatible device.
- Keep spare cells in their packaging and away from moisture.
Key Product Details
Built With In Mind
This pack suits you when the battery marking inside your smart lock clearly specifies CR2450.
Look Elsewhere When
Home4me CR123A Lithium Batteries suit compatible cylindrical smart locks rather than coin-cell compartments.
CR2025 cells share the same nominal voltage as the CR2032, but their thickness differs. That small physical difference matters because a compartment may accept one format while preventing the other from seating correctly.
This pack is especially relevant for sensitive lock electronics requiring controlled output. Its 3.0V specification includes a stated tolerance, which helps explain the fit beyond the generic label.
Useful Highlights
- The stated voltage tolerance supports steady operation in compatible electronics.
- Up to 90% charge retention over a decade makes stored replacements practical.
- Five cells provide useful coverage for a lock and nearby household devices.
- Leak-resistant construction reduces concern during storage and handling.
- Child-resistant packaging helps contain the small cells.
Small Caveats
- Actual lock compatibility depends on thickness as well as diameter.
- Frequent keypad use can shorten service life compared with a lightly used device.
Technical Highlights
Who Should Grab It
You should choose this pack when your smart lock specifically calls for CR2025 cells and consistent voltage matters to the device.
Reach For A Different Pick When
PHILIPS CR2032 Lithium Coin Cell Batteries are the better fit for locks that specify the wider CR2032 format.
The CR2430 serves as another format-specific choice, and the physical fit deserves more attention than its familiar 3V rating. Smart locks vary more in battery dimensions than many household electronics, so the marking inside the compartment should control your choice.
The five-count format is practical for maintaining a compatible lock, remote, or scale under one household battery routine. You may end up using the extras elsewhere, but only where the device specifies CR2430.
A Few Highlights
- Long stated storage life supports keeping a spare pack indoors.
- Stable output suits compatible low-drain devices.
- The blister pack improves organization and limits casual access.
Points To Note
- CR2430 dimensions must match your lock’s compartment exactly.
- Store the pack sealed and dry, particularly in humid entry areas.
- The five-cell quantity can be unnecessary for a single-device home.
Made For
This option suits households whose smart locks and other compatible devices use the CR2430 format.
Where A Sibling Pick Shines
PHILIPS CR2016 Lithium Coin Cell Batteries fit thinner coin-cell locks that require the smaller CR2016 body.
Rechargeable AA cells create a different ownership rhythm from single-use coin cells. You keep the same eight batteries in circulation and recharge them through the integrated case, which is attractive for locks used several times each day.
Compatibility still comes first: many smart locks expect disposable AA cells and may not recognize rechargeable lithium chemistry. The 1.5V output is suitable for compatible electronics, while the Type-C case and status detection simplify charging.
Positive Takeaways
- The eight-cell set supports high-use AA devices and repeated rotations.
- A 1.5V output matches common disposable AA devices.
- The Type-C charging case combines charging with compact storage.
- The stated 3600mWh capacity targets sustained device runtime.
- A 1200-cycle rating supports long-term rechargeable ownership.
Less-Strong Areas
- Some smart locks specifically prohibit rechargeable cells.
- You must keep the complete eight-cell set organized for straightforward rotation.
- Rechargeable lithium AA cells cost more upfront than basic disposable cells.
At A Glance
Who Will Love This
You benefit most from this system when a compatible high-use lock accepts rechargeable 1.5V AA lithium cells.
Not Your Match When
Home4me CR123A Lithium Batteries suit locks requiring a single-use cylindrical CR123A rather than rechargeable AA cells.
The CR123A is a cylindrical cell, so it belongs only in locks designed around that shape and size. Compared with the compact coin cells here, its 1650mAh capacity makes it more relevant to devices expecting a larger energy reserve.
The 16-count quantity suits maintenance-conscious households or technicians supporting several compatible devices. These cells are non-rechargeable, so your routine is simpler but still based on scheduled replacement.
Practical Pluses
- The 1650mAh rating supports devices with higher current requirements.
- A 16-cell pack suits multi-device homes and maintenance stockpiles.
- The stated 3V output matches common lithium-device expectations.
- A 10-year storage characteristic supports dry indoor reserves.
Worth Bearing In Mind
- The cells are non-rechargeable and cannot be returned to the charger case.
- A large quantity is unnecessary for homes with one CR123A device.
- Keep spare cells dry and away from extreme heat.
Quick Facts
Whose Shelf It Belongs On
This pack suits you when you maintain multiple CR123A devices or prefer a substantial dry storage reserve.
Another Choice May Suit
PHILIPS CR2450 Lithium Coin Cell Batteries offer a flat coin-cell alternative for locks designed around that larger format.
Choosing the Battery Format Your Lock Requires
Confirm the exact cell code
The code printed inside the battery compartment or lock manual takes priority over appearance. CR2016, CR2032, CR2025, CR2430, and CR2450 cells share a 3V nominal voltage but differ physically, so each requires its own compartment.
Match voltage and chemistry
Most locks in this group accept 3V lithium cells, while rechargeable AA models need 1.5V power. Verify chemistry restrictions before using rechargeable batteries in a lock designed for disposable cells.
Consider how often the lock operates
A keypad lock used throughout the day draws more energy than a lock receiving occasional keycode entries. Higher-use households benefit from the stated AA capacity or a large cylindrical-cell pack, subject to the lock’s stated requirements.
Plan for dry, organized storage
Keep spare cells in their original packaging and away from moisture, extreme heat, and loose metal objects. Store rechargeable AA batteries in their charging case, and inspect the compartment before every replacement.
Avoidable Battery Mistakes
Mistakes Worth Dodging
Choosing by diameter alone can prevent a cell from seating correctly. Match the complete code, voltage, chemistry, and permitted quantity rather than assuming every 3V battery is interchangeable.
What Separates Premium From Basic
Long storage life, controlled voltage, leak-resistant construction, and child-resistant packaging add value in homes with children or devices that must remain ready. The upgrade matters most when your lock manual specifies those attributes or you keep spare cells for long periods.
Frequently Asked Questions
How Do I Know Which Battery My Smart Lock Uses?
Check the battery compartment, inside the lock’s cover, or its documentation. The complete battery code is the most reliable guide.
Can I Use A Rechargeable AA Battery In A Smart Lock?
Only when the lock manufacturer permits rechargeable chemistry. Some locks are designed exclusively for disposable AA cells.
Are CR2032 And CR2025 Batteries Interchangeable?
No. They have the same nominal voltage but different thicknesses, so one may not fit or make proper contact.
Should I Keep Replacement Batteries Stored?
Yes. Keep them sealed, dry, and away from extreme temperatures or loose conductive objects to preserve readiness and reduce handling risks.
Do Coin Cells Expire?
They can lose usable capacity while stored. Low self-discharge lithium cells remain suitable as long-term spare power, subject to their stated storage life.
The Takeaway
The right battery begins with the code printed for your lock, not the number of cells in the pack. Choose PHILIPS coin cells for compatible flat compartments, the rechargeable AA set only for supported high-use locks, and Home4me CR123A cells for larger cylindrical devices. Verify fit and chemistry before ordering, then keep a dry, organized spare set for the next replacement.
