A dead key fob always shows up at the wrong moment: in the rain, with arms full of groceries, on a cold Monday morning. The right coin cell or specialty cell restores your remote and your day in seconds, and a smart pick means you keep a spare on hand for the next surprise. This guide pulls together dependable cells, full remote replacements, protective shells, and one fun detour, so you can solve the problem once and forget about it.
A Snapshot Of The Selections
Duracell 2032 Lithium Coin Battery (2 Pack)
Duracell 21/23 12V Alkaline Battery (4 Pack)
Energizer 2032 Lithium Coin Battery 8 Pack
Energizer 2450 Lithium Coin Battery (6 Pack)
Duracell 1616 Lithium Coin Battery (Single)
GM Genuine Parts 22951510 6-Button Keyless Remote
New Wave Toys RepliCade Insert Coin Keychain
AJT DESIGN Replacement Key Fob Case for Tundra and Tacoma
iJDMTOY Silicone Key Fob Cover for Ford F-150 and Explorer
Alliskeys Key Fob Shell with Battery for Chevrolet 2016 to 2024
More On The Choices That Made The List
The CR2032 is the most common coin cell hiding inside modern key fobs, and this two-pack from Duracell covers that need without ceremony. Each cell delivers 3V of lithium power, sized to drop into the remote tray of most Honda, Toyota, Nissan, Subaru, and Hyundai keys, and the same cell fits Apple AirTags, so spares pull double duty around the house.
Unlike the specialty 21/23 cell later on the list, this CR2032 fits the remote you actually use every day, and most owners report years of stable shelf life when the pack stays sealed in a drawer.
Where It Delivers
- Two-pack format means one cell goes in the fob, one stays on a shelf as insurance
- 3V lithium chemistry handles temperature swings in hot and cold cabins
- Trusted fit across mainstream Japanese and Korean remotes
- Bitter-taste coating discourages accidental child ingestion
Trade-Offs Worth Weighing
- Only two cells per pack, so a multi-fob household may run through them quickly
- Some owners report receiving packs with slightly scratched surfaces, harmless but cosmetic
Made For
Daily drivers with a single CR2032-powered fob who want a name-brand cell they can swap in without second-guessing.
Consider Something Else When
You run a fleet of fobs and AirTags, where the Energizer 2032 8-pack below spreads inventory further.
The 21/23 cell is a tiny cylindrical 12V battery used by older remotes, garage door openers, and specialty electronics. This four-pack from Duracell fills that niche slot when a CR2032 simply will not fit, and the alkaline chemistry keeps cost reasonable for a battery most people replace only every few years.
If your remote predates the coin-cell era or your keyless entry system came out of an early-2000s GM or Chrysler, this is the cell that actually belongs inside.
The Good Stuff
- Solves the awkward 21/23 form factor that big retailers often skip
- Four cells give plenty of headroom for multiple devices
- Trusted alkaline chemistry handles moderate drain devices well
Some Limits To Know
- Not interchangeable with the CR2032 cells powering modern fobs
- Alkaline chemistry drains faster than lithium under constant draw
Right Fit For
Vintage key fobs, car alarm remotes, and specialty garage devices that take the unusual 21/23 cell.
Swap It Out When
Your remote takes a CR2032, in which case the Duracell 2032 above is the cheaper, more useful choice.
Two four-packs give you eight CR2032 cells in one purchase, and for households juggling multiple fobs, AirTags, watches, and bathroom scales, that volume pays off fast. Energizer ships each four-pack in child-resistant packaging, and the cells slide cleanly into Apple AirTag trays and remote housings.
Compare that to the Duracell two-pack earlier in this list: same chemistry, four times the inventory, and a sensible choice when you would rather replace every coin-cell device on the same shopping trip.
Useful Highlights
- Eight-cell total absorbs the cost of stocking a junk drawer for years
- Compatible with AirTag, fob, fitness tracker, and thermometer alike
- Child-resistant packaging helps keep curious hands out
Honest Caveats
- Bulk format assumes you actually need eight cells; light users may sit on extras
- Split into two four-packs, so packaging waste runs higher than the two-pack option above
Who It Suits Best
Multi-fob families, AirTag households, and anyone who would rather buy coin cells once and forget about them for a couple of years.
Reach For A Different Pick When
You only need to revive one remote, where the Duracell two-pack keeps things simpler and tidier.
The CR2450 looks like the CR2032 at a glance, but the dimensions differ enough that an honest swap breaks a fob tray. This six-pack from Energizer solves the right-cell problem for keyless entry systems, garage openers, and remotes that specifically call for the 2450, and the lithium chemistry delivers steady 3V across the life of the cell.
If the 2032 in the first pick is the everyday coin cell, the 2450 is the specialty sibling you keep on hand once you discover your remote takes the larger one.
A Few Highlights
- Correct form factor for 2450-specific fobs, watches, and entry pads
- Six-cell count covers spare remotes and a couple of devices at once
- Lithium chemistry handles wider temperature ranges than alkaline
Small Caveats
- Will not substitute for the smaller CR2032, so keep both sizes on hand if you run mixed remotes
- Six-pack size feels oversized for single-fob owners
Best Suited To
Owners of vehicles or systems with CR2450 power needs, plus anyone replacing coin cells across watches, keyless pads, and remotes in one sweep.
A Better Fit Elsewhere
Standard CR2032 fob owners, for whom the Duracell 2032 two-pack or Energizer 2032 8-pack stays more practical.
The CR1616 is the coin cell most shoppers never think about until they crack open a remote that needs it. This Duracell single pack handles that exact moment, and the 3V lithium chemistry gives it the long shelf life you want from a battery you only need once every few years.
Where the CR2032 fits mainstream fobs, the 1616 quietly powers a handful of European remotes, smaller watches, and a few specialty electronics that the rest of this list never addresses.
What Makes Sense
- Fills the narrow 1616 niche without forcing a multi-pack purchase
- Duracell lithium construction supports long storage in a drawer
- 3V output matches what most 1616 devices expect
Room For Improvement
- Single-cell format means no spare once the first swap is done
- Niche chemistry, so you cannot repurpose it across mainstream 2032 fobs
Who Should Grab It
Owners of specific vehicles, watches, or remotes that explicitly call for the CR1616 form factor.
Skip It When
Your remote takes a 2032 or 2450 cell, in which case the earlier Energizer picks match the form factor your device actually wants.
Sometimes the remote is the problem, not the battery. This GM Genuine Parts unit replaces the original six-button keyless transmitter for compatible late-model GM trucks and SUVs, with lock, unlock, panic, liftgate, liftglass, and remote start all routed through a factory-spec housing.
Unlike the coin-cell picks earlier on this list, this is a complete remote, so programming at a dealer or locksmith usually enters the picture. The upside is a true OE replacement that matches what originally shipped on the vehicle.
Practical Pluses
- Six-button layout covers lock, unlock, panic, liftgate, liftglass, and remote start
- OE-grade build matches factory fit and finish
- Backed by General Motors as the recommended replacement
Things To Weigh Up
- Programming often requires a dealer visit or specialty tool, which adds cost and time
- Higher price tier than a coin-cell swap, so it only makes sense when the original remote is dead or missing
Feature Snapshot
Whose Shelf It Belongs On
GM truck and SUV owners whose factory remote has died, gone missing, or stopped responding reliably to the original transmitter.
Look Elsewhere When
You just need a fresh cell inside a working remote, in which case the Duracell 2032 two-pack from pick one is a much smaller investment.
This pick breaks from the rest of the list on purpose. The RepliCade Insert Coin Keychain is a diecast metal replica of an arcade cabinet coin return, scaled to 1:1 with a push-button LED that lights up for about 10 seconds per press and an auto shut-off to save the battery.
It uses an internal coin cell rather than serving as one, so it earns its spot as a fun detour for retro-gaming fans who want a small piece of arcade heritage clipped to a keychain. At roughly two inches tall and around 3.2 ounces, it carries more weight than the average plastic charm.
What Works In Its Favor
- Diecast metal body delivers a premium feel and satisfying heft
- Push-button LED with auto shut-off extends battery life
- 1:1 scale replica appeals to arcade collectors and gift shoppers
Worth Noting
- Not a functional battery, just a novelty that holds one
- Heftier than typical keychain charms, so pocket carry feels noticeable
Built With In Mind
Retro gaming fans, arcade collectors, and gift shoppers looking for a small but solid nod to 90s gaming cred.
Where Another Pick Suits Better
Anyone who actually needs to power a real remote, where the Duracell 2032 two-pack is the honest answer.
Stock Toyota fob shells crack around the key ring tab, especially on trucks that see real daily use. AJT DESIGN’s replacement case uses injection-molded PC-ABS for the body, bolts together with the included 7/64″ Allen key, and reuses your original electronics, rubber seal, battery, and buttons for a clean rebuild.
Compatible with 2005 to 2015 Tacoma and 2007 to 2017 Tundra models, this shell skips the soft silicone cover route and addresses the actual cracked-housing problem owners commonly report.
Everyday Perks
- Rigid PC-ABS resists drops, scratches, and heat better than soft sleeves
- Bolt-together design makes the fob fully serviceable for future battery swaps
- Reinforced key ring loop tackles the most common OEM failure point
- Reuses original electronics, seal, and battery, so the install stays familiar
Points To Keep In Mind
- Requires moving the internals over by hand, with no electronics included
- Only fits the specific Tacoma and Tundra model years listed
Perfect Match For
Toyota Tacoma and Tundra owners whose OEM fob shell has cracked, snapped, or grown rough around the key ring loop.
Another Choice May Suit
Ford F-150 and Explorer owners, who should look at the iJDMTOY silicone cover in pick nine instead.
Smart keys spend a lot of time in pockets next to coins and keys, and silicone covers soak up that daily punishment without adding much bulk. This two-pack from iJDMTOY fits the 2015 to 2017 Ford F-150 and the 2016 to 2017 Ford Explorer three-button smart key, with a soft, odor-free silicone shell that hugs the OEM remote.
Where the AJT DESIGN shell in the previous pick is a full replacement housing, this is a slip-on layer for owners who would rather prevent scratches than rebuild the remote from scratch.
The Practical Payoff
- Two covers per pack covers a spare key or a future swap
- Soft silicone adds grip without making the key feel bulky
- Direct fit for the OEM smart key, no trimming required
Smaller Caveats
- Only fits specific 2015 to 2017 F-150 and 2016 to 2017 Explorer model years
- Silicone can attract lint over time, depending on pocket contents
Feature Snapshot
The Right Fit
Ford F-150 and Explorer owners who want a low-effort way to keep their smart keys free of pocket scratches.
Not Your Match When
Your factory shell has already failed, where the AJT DESIGN replacement case from the previous pick actually fixes the housing.
For a Chevy smart key with a cracked shell or a fading battery, this Alliskeys kit ships a four-button aftermarket shell plus a fresh coin cell, so you can rebuild the remote without paying dealer prices. It is compatible with Chevrolet models from 2016 through 2024 that use the HYQ4AA, HYQ4EA, HYQ4AS, or HYQ4ES part numbers, covering lock, unlock, remote start, and panic alarm.
The kit is an empty shell plus a battery, with no electronics or transponder chip inside, so DIYers comfortable transferring the internals from their old fob save real money versus a dealer-supplied replacement.
Notable Upsides
- Four-button layout covers lock, unlock, remote start, and panic alarm
- Shell plus battery package handles two common failure points at once
- Wide Chevrolet coverage across the 2016 to 2024 model years
Points To Note
- Shell only, so original electronics and transponder chip must transfer over
- Cross-check the FCC ID and model year before ordering to avoid a fitment miss
Feature Snapshot
Best Suited To
DIY Chevy owners comfortable moving electronics between shells who want a complete shell plus battery refresh in one package.
Where A Sibling Pick Shines
Anyone needing a complete OE remote with electronics pre-installed, where the GM Genuine Parts unit from pick six fits that bill instead.
What To Weigh Before Picking New Coin Cells
Choosing the right battery starts with the print on your current cell. Most modern fobs use CR2032 or CR2450, but older GM and Chrysler remotes lean on the 21/23 cell, and European models sometimes reach for the rarer CR1616. A coin cell is a small lithium disc; the digits describe diameter and thickness in millimeters. Open the fob tray before ordering, then match both the chemistry and the size on the label.
Buy at least two cells per fob. Fresh coin cells last years on the shelf, and having a spare in a drawer beats an emergency run when the remote dies in a parking lot. For households juggling multiple fobs, AirTags, watches, and keyless pads, an eight-pack or six-pack pulls double duty across all of those devices at once.
Storage matters more than most people think. Coin cells keep best at room temperature, away from direct heat, and ideally in the original blister pack until use. Tossing loose cells in a kitchen drawer can lead to shorted contacts and lost capacity before the battery ever powers anything.
When the fob itself is the problem, a fresh cell will not save you. Look at replacement shells, full OE remotes, and silicone covers as separate categories, each useful in a different scenario. A worn case, a dead remote, and a scratched surface all call for different fixes, and the picks at the bottom of this list address each one.
Common Pitfalls And Upgrade Worth
Where Shoppers Go Wrong
Buying by brand alone leads to mismatches more often than not. The biggest mistake is grabbing a 2032 when the fob takes a 2450, or assuming a CR2032 will substitute for a CR1616 just because both look like silver discs. The next common miss is forgetting that a battery swap on a worn shell still leaves you with a cracked housing, so the remote keeps falling apart in your pocket. Always check the size printed on the old battery, then verify the FCC ID on the shell before ordering anything beyond a coin cell.
What The Higher Tier Buys
Premium fob shells and OE replacement remotes cost more because they tackle the housing and electronics rather than just the cell inside. The extra spend makes sense when the OEM shell has cracked, the buttons have stopped responding, or the remote itself has gone missing. For most daily drivers, a fresh name-brand coin cell does the job, and you can leave the higher tier on the shelf until the housing actually fails.