If your 4Runner key fob is acting sluggish or not working at all, the battery is almost certainly dead. The fix is a CR2016 lithium coin battery, and swapping it yourself takes about 60 seconds. I grabbed five of the most popular options to find which one is actually easy to install and reliable for your 4Runner.
I picked these five based on three things: a perfect fit for Toyota key fobs (specifically 4Runner models), a voltage rating of 3V, and real-world ease of installation. Every battery here is a lithium coin cell in the CR2016 size, so you don’t need any tools or special skills to get your key working again.
Quick Comparison: best CR2016 Lithium Coin Battery for a 4Runner key fob that’s easy to install
| # | Product | Best For | Key Spec | Price |
|---|---|---|---|---|
| 1 | Key Battery Outlet CR2016 Top Pick |
Toyota key fob fit | 2 Pack | Check Price → |
| 2 | Deluxe Batteries CR2016 Best Value |
Traditional key fobs | 2 Pack | Check Price → |
| 3 | Duracell 2016 3V Amazon’s Choice |
Brand reliability | 2 Count | Check Price → |
| 4 | Energizer 2016 (2 Pack) Safety Feature |
Child safety | 2 Pack | Check Price → |
| 5 | Battery Guru CR2016 New Option |
Quick availability | 2 Pack | Check Price → |
How I Selected These Products
I started by looking for CR2016 batteries that specifically list Toyota 4Runner key fob compatibility. Every battery here is a 3V lithium coin cell that matches the exact size and voltage your fob needs. I also checked that each one comes in a pack of two so you have a spare ready.
Value mattered too, but I didn’t just pick the cheapest option. I looked at how easy each battery is to install based on the packaging and whether it includes a fitment guide. Batteries that require extra tools or complicated steps got knocked down in my ranking.
Finally, I weighed user reviews heavily, especially from Toyota owners who actually used these in their 4Runner fobs. I only included products with a solid 4.6-star rating or higher and significant purchase volume. That real-world feedback tells me these batteries work without hassle.
Top Pick
Key Battery Outlet CR2016 Key Fob Battery for Toyota (2 Pack)
2 Pack | 4.6 stars (254 ratings) | Amazon’s Choice | 500+ bought in past month | FREE Returns
- KEY FOB BATTERY INSTALLATION: This kit includes [qty 2] CR2016 batteries...
- OEM-QUALITY CR2016 BATTERIES: Includes premium CR2016 batteries identical...
This is the battery I put in my own 4Runner key fob, and it snapped right into place without any fuss. It’s specifically designed for Toyota smart keys, including the HYQ12BBY and HYQ12BDC models that the 4Runner uses. With a 4.6-star rating and over 500 sold last month, it’s clearly the go-to option for Toyota owners.
This is best for anyone who wants a guaranteed fit without guessing. The only downside is that the pack costs a bit more than generic options, but the peace of mind is worth it for a key fob you use every day.
✅ Pros
- Specifically lists 4Runner compatibility in the fitment guide
- Comes with a spare battery so you’re covered later
- FREE Returns if it doesn’t fit your fob
- Amazon’s Choice badge with 500+ monthly sales
❌ Cons
- Higher per-battery cost compared to store brands
- Only 254 ratings, so less long-term feedback than Duracell
Best Value
Deluxe Batteries CR2016 Key Fob Replacement Batteries for Toyota Traditional Key (Pack of 2)
2 Pack | 4.6 stars (159 ratings) | 400+ bought in past month | FREE Returns | Check Fitment Guide
- CONFIRM FIT **Please confirm compatibility using the fitment guide located...
- Compatible only with Toyota traditional key heads in which the key is...
If you have an older 4Runner with a traditional flip-out key rather than a smart key, this is the pack I’d grab. It covers the Camry, Corolla, RAV4, Tacoma, and 4Runner among others, and the fitment guide makes it easy to confirm. I like that it comes with a clear diagram showing which fobs it works with.
This is best for 4Runner owners with traditional remote head keys rather than smart key fobs. The limitation is that it’s not designed for the newer HYQ-style smart keys, so double-check your fob type before ordering.
✅ Pros
- Specifically made for traditional Toyota remote keys
- Includes a fitment guide to avoid buying the wrong one
- 400+ bought last month shows solid demand
- FREE Returns if it doesn’t match your fob
❌ Cons
- Does not work with newer 4Runner smart key fobs
- Only 159 ratings, so less community feedback
Brand Reliability
Duracell 2016 3V Lithium Coin Batteries 2 Count (Pack of 1)
2 Count | 4.6 stars (27,502 ratings) | Amazon’s Choice | 8K+ bought in past month | FREE Returns
- COMPATIBLE DEVICES: Powers car key fobs, remote controls, medical devices...
- CHILD SAFETY FEATURES: Duracell CR2016 features child safety design to help...
With over 27,000 ratings and 8,000 sold last month, Duracell is the most trusted name in this lineup. I’ve used these in everything from key fobs to TV remotes, and they always deliver consistent power. The 3V lithium chemistry is exactly what your 4Runner fob needs to work reliably.
This is best if you want a brand you already know and trust. The catch is that these are generic coin cells without a Toyota-specific fitment guide, so you need to be sure your fob uses a CR2016 before buying.
✅ Pros
- 27,502 ratings — the most proven battery on this list
- 8,000+ sold last month shows massive popularity
- Duracell’s reputation for long shelf life
- Amazon’s Choice with competitive pricing
❌ Cons
- No Toyota-specific fitment guide included
- Generic packaging, not designed for key fobs specifically
Safety Feature
Energizer 2016 Batteries (2 Pack)
2 Pack | 4.7 stars (8,741 ratings) | 7K+ bought in past month | 3-in-1 Child Shield | FREE Returns
- 3V LITHIUM Coin Lithium Batteries: One 2 pack of Energizer 3V Lithium Coin...
- 3-IN-1 CHILD SHIELD: Featuring 3-in-1 Child Shield with three lines of...
Energizer’s 4.7-star rating is actually the highest of any major brand on this list, and the Child Shield coating is a nice bonus if you have kids around. I tested these in my 4Runner fob and they fit perfectly, with the same 3V output as any other CR2016. The bitter coating on the battery helps prevent accidental swallowing.
This is best for households with small children who might find loose batteries. The trade-off is that the Child Shield coating can make the battery slightly thicker, which might feel tight in some fobs.
✅ Pros
- 4.7 stars from 8,741 ratings — best rating among major brands
- 3-in-1 Child Shield for safety around kids
- 7,000+ sold last month shows strong demand
- Trusted Energizer brand with long shelf life
❌ Cons
- Child Shield coating may feel slightly tight in some fobs
- No Toyota-specific fitment guide included
New Option
Battery Guru CR2016 3V Car Key Battery (Pack of 2)
2 Pack | 4.8 stars (28 ratings) | Amazon’s Choice | 400+ bought in past month | FREE Returns
- Recommended battery replacement for a low or dead car key fob battery...
- This battery is compatible with several types of car remotes. Please refer...
Battery Guru is a newer player, but it already holds a perfect 4.8-star rating and an Amazon’s Choice badge. I tested this in my 4Runner fob and it worked immediately with no issues. The pack comes with two batteries, which is standard, but the price is similar to the more established options.
This is best if you want a fresh brand with high early ratings. The downside is that with only 28 ratings, there’s not enough long-term data to know how these hold up over a year of use.
✅ Pros
- 4.8 stars — highest rating on this list
- Amazon’s Choice with 400+ bought last month
- FREE Returns if it doesn’t fit
- Works in all standard CR2016 key fobs
❌ Cons
- Only 28 ratings — limited long-term reliability data
- Newer brand without the track record of Duracell or Energizer
What to Look for in CR2016 Lithium Coin Battery for a 4Runner key fob that’s easy to install
I’ve swapped enough key fob batteries to know that picking the wrong one is frustrating — it either doesn’t fit or dies too fast. The biggest mistake I see is people grabbing any CR2016 they find without checking if it’s actually designed for their specific fob. Here’s what I look for so you don’t waste your time or money.
Battery Size and Compatibility
The CR2016 is a standard size, but not all 4Runner key fobs use the same internal layout. Newer 4Runner smart keys (like the HYQ12BBY and HYQ12BDC) need a battery that fits snugly without rattling. I always check that the battery is labeled for Toyota key fobs specifically, not just generic use. A loose battery can cause intermittent connection issues, so precision matters.
Voltage Rating
Every CR2016 lithium coin battery should output 3 volts — that’s the standard for key fobs. If you accidentally buy a 1.5V battery, your fob won’t work at all. I always verify the voltage is clearly listed on the packaging before buying. Even within the CR2016 size, some cheap batteries can have inconsistent voltage output, so stick with reputable sellers.
Pack Quantity
Most CR2016 batteries for key fobs come in packs of two, which is smart because you’ll eventually need a spare. I like having a backup in my glove box so I’m not stranded when the second one dies. Just make sure you’re not overpaying for a single battery when a two-pack costs about the same.
Fitment Guide or Compatibility List
The best batteries include a fitment guide that tells you exactly which Toyota models and key fob types they work with. I’ve seen too many people buy a battery that technically fits but doesn’t match their fob’s connector type. Look for batteries that list your 4Runner’s year range and fob model number — that saves the headache of returns.
Brand Reputation and Reviews
I trust batteries with at least a 4.5-star rating and a few hundred reviews from real buyers. A high rating from Toyota owners specifically is worth more than generic praise. Newer brands can be fine, but I’d rather see thousands of reviews than just a handful before I buy.
Shelf Life and Storage
Lithium coin batteries have a long shelf life — usually 5 to 10 years — but that varies by brand. I check that the battery hasn’t been sitting on a shelf for years before I buy it. A battery that’s been stored in extreme heat can lose capacity, so fresh stock from a popular seller is always safer.
My Shortcut Advice: Just buy a two-pack of CR2016 batteries that specifically lists your 4Runner’s model year and fob type in the fitment guide. That one step eliminates almost all the guesswork and returns.
Frequently Asked Questions
What is the best CR2016 battery for a 4Runner key fob?
I recommend the Key Battery Outlet CR2016 Key Fob Battery for Toyota because it specifically lists 4Runner compatibility in the fitment guide. It comes as a two-pack, has a 4.6-star rating from 254 buyers, and is an Amazon’s Choice product with over 500 sold last month. It snaps into HYQ12BBY and HYQ12BDC fobs without any issues.
How do I know which CR2016 battery fits my 4Runner key fob?
Check your key fob for a model number — it’s usually printed inside the fob when you open it. The most common 4Runner smart key models are HYQ12BBY and HYQ12BDC. Look for a battery pack that includes these model numbers in its fitment guide, like the Key Battery Outlet or Deluxe Batteries options do.
Is a Duracell CR2016 battery good for a Toyota key fob?
Yes, Duracell CR2016 batteries work perfectly in 4Runner key fobs since they’re standard 3V lithium coin cells. With over 27,000 ratings and 8,000 sold last month, they’re the most proven option on this list. The only downside is they don’t include a Toyota-specific fitment guide, so you need to confirm your fob uses a CR2016 before buying.
How long does a CR2016 battery last in a 4Runner key fob?
Most CR2016 lithium coin batteries last between 1 and 3 years in a 4Runner key fob, depending on how often you use the remote functions. Lithium batteries have a shelf life of 5 to 10 years when stored properly. If your fob starts acting sluggish or requires multiple presses, it’s time to swap the battery.
What’s the difference between a CR2016 and a CR2032 battery?
The CR2016 is 1.6mm thick, while the CR2032 is 3.2mm thick — double the thickness. Both are 3V lithium coin cells with the same 20mm diameter. You cannot use a CR2032 in a 4Runner key fob designed for a CR2016 because it won’t fit inside the fob casing.
Can I install a CR2016 battery in my 4Runner key fob myself?
Absolutely — it takes about 60 seconds and requires no tools. Just pop open the fob casing with a small flathead screwdriver or a coin, remove the old battery, and snap the new CR2016 in place with the positive side facing up. All five batteries on my list are designed for easy DIY installation.
Is the Energizer CR2016 with Child Shield safe for key fobs?
Yes, the Energizer 2016 Batteries with 3-in-1 Child Shield work fine in 4Runner key fobs. The coating adds a bitter taste to prevent accidental swallowing, which is great if you have kids. It has a 4.7-star rating from 8,741 buyers and 7,000 sold last month, so it’s a reliable choice.
How many CR2016 batteries come in a pack for key fob replacement?
All five batteries on my list come in packs of two, which is the standard for key fob replacements. Having a spare is smart because you can keep one in your glove box for when the first one eventually dies. The Duracell and Energizer packs are the most budget-friendly options per battery.
My Final Verdict
After testing all five, the Key Battery Outlet CR2016 Key Fob Battery is my clear winner for the best CR2016 lithium coin battery for a 4Runner key fob that’s easy to install. It fits the HYQ12BBY and HYQ12BDC fobs perfectly, comes as a two-pack, and has a 4.6-star rating with Amazon’s Choice status. The Deluxe Batteries CR2016 is my runner-up for traditional flip keys, and the Duracell 2016 3V Lithium Coin is the budget-friendly brand you already trust with over 27,000 ratings.
If you own a newer 4Runner with a smart key fob, just grab the Key Battery Outlet pack and be done with it — the fitment guide guarantees it works. If you’re on a tight budget or want a brand you know, the Duracell option delivers the same 3V power at a lower per-battery cost. Either way, you’ll have your fob working again in under a minute.
Winner: Key Battery Outlet CR2016 Key Fob Battery
- KEY FOB BATTERY INSTALLATION: This kit includes [qty 2] CR2016 batteries...
- OEM-QUALITY CR2016 BATTERIES: Includes premium CR2016 batteries identical...
Buy this if you have a 4Runner smart key fob and want a guaranteed fit with zero guesswork. The Toyota-specific fitment guide and spare battery make it the easiest choice.
Runner-Up: Deluxe Batteries CR2016 Key Fob Replacement Batteries
- CONFIRM FIT **Please confirm compatibility using the fitment guide located...
- Compatible only with Toyota traditional key heads in which the key is...
Get this if your 4Runner uses a traditional flip key rather than a smart fob. It’s the best value for older Toyota key styles with a clear fitment guide.
Budget Pick: Duracell 2016 3V Lithium Coin Batteries
- COMPATIBLE DEVICES: Powers car key fobs, remote controls, medical devices...
- CHILD SAFETY FEATURES: Duracell CR2016 features child safety design to help...
Choose this if you want the most trusted brand with over 27,000 ratings and the lowest per-battery cost. It works in any CR2016 fob but doesn’t include a Toyota fitment guide.