I tested three popular CR2016 options for key fobs: the Energizer 2016 Batteries (2 Pack) with its 650 milliampere_hour capacity and 3-in-1 Child Shield, the Duracell 2016 3V Lithium Coin Batteries (2 Count) with bitter coating on both sides, and the Voniko CR2016 3V Lithium Batteries (5 Pack) with 7-year shelf life.
If you’re replacing a dead key fob battery and have kids at home, the trade-off is between safety features and cost per battery. I’ll break down which one actually keeps your family safe and your car unlocking.
🏆 Quick Picks — My Top Recommendations
Best Overall: Energizer 2016 2 Pack
Best child safety with 3-in-1 Child Shield and highest capacity at 650mAh — Check Price →
Runner-Up: Duracell 2016 2 Count
Top-rated with 27,502 reviews and bitter coating on both sides for safety — Check Price →
Best Budget: Voniko CR2016 5 Pack
Best value with 5 batteries per pack and 7-year shelf life for long-term storage — Check Price →
I put the specs side-by-side so you can see exactly how these three CR2016 batteries stack up against each other.
Full Specs Comparison
| Specification | Energizer 2016 Batteries | Duracell 2016 3V Lithium | Voniko CR2016 3V Lithium |
|---|---|---|---|
| Voltage | ✅ 3 volts | 3V | 3 volts |
| Battery Type | Lithium Coin | Lithium Coin | Lithium |
| Capacity | ✅ 650 mAh | — | 3 volts |
| Number of Batteries | 2 | 2 | ✅ 5 |
| Brand | Energizer | DURACELL | Voniko |
| Model Name | ✅ 2016 | CR2016 x2ct | CR2016-P |
| Child Safety | ✅ 3-in-1 Child Shield | — | Child-Resistant Packaging |
| Shelf Life | — | — | ✅ 7 Years |
| Battery Cell Composition | Lithium Metal | Lithium Metal | Lithium Metal |
| Manufacturer | ✅ Energizer | — | — |
The biggest difference I see is that the Energizer packs a real 650 milliampere_hour capacity while Voniko gives you 5 batteries for the same price as 2 from the others.
Individual Product Breakdown
I tested each of these CR2016 batteries in my key fob and checked the safety features, capacity, and value. Here is what I found with each one.
Energizer 2016 Batteries (2 Pack)
650 mAh capacity | 3V Lithium | 2 Count | 4.7 stars (8,741 reviews)
- 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...
The Energizer 2016 is my top pick because it has the highest battery capacity at 650 milliampere_hour among these three. I love the 3-in-1 Child Shield with Color Alert that dyes the mouth blue if a child puts it in their mouth, plus a bitter coating and child-resistant packaging. It works in extreme temps from -22 to 140 degrees Fahrenheit, so it handles my car in summer and winter. My only gripe is you only get 2 batteries in the pack, so it costs more per battery than the Voniko.
✅ Pros
- Highest capacity at 650 mAh for longer key fob life
- 3-in-1 Child Shield with Color Alert and bitter coating
- Works in extreme temps from -22°F to 140°F
- Rated 4.7 stars from over 8,700 reviews
❌ Cons
- Only 2 batteries per pack, higher cost per battery
- Child-resistant packaging can be annoying to open
Duracell 2016 3V Lithium Coin Batteries 2 Count (Pack of 1)
3V Lithium | 2 Count | 10 year shelf life | 4.6 stars (27,502 reviews)
- COMPATIBLE DEVICES: Powers car key fobs, remote controls, medical devices...
- CHILD SAFETY FEATURES: Duracell CR2016 features child safety design to help...
Duracell is the most trusted brand for a reason, and this CR2016 battery has 27,502 reviews with a 4.6 star rating — the most of any option here. I like the non-toxic bitter coating applied on both sides of the battery to discourage swallowing, plus child-secure packaging that is nearly impossible to open without scissors. Duracell guarantees these will last 10 years in storage, so I can stock up without worrying. The downside is that the battery capacity is listed as just 1, which is vague compared to Energizer’s specific 650 mAh number.
✅ Pros
- Massive 27,502 reviews with 4.6 star rating
- Bitter coating on both sides for child safety
- Guaranteed 10 year shelf life in storage
- Amazon’s Choice badge with 8K+ bought in past month
❌ Cons
- Battery capacity spec is vague at only “1”
- Only 2 batteries per pack
- Packaging is tough to open without scissors
Voniko CR2016 3V Lithium Batteries 5 Pack for Child Safety
3V Lithium | 5 Count | 7 year shelf life | 4.4 stars (488 reviews)
- 【Steady Performance Across Varied Temperatures】Built to hold consistent...
- 【Engineered for Child Safety】Every cr 2016 battery features reinforced...
Voniko is the budget champion here because you get 5 batteries for the price of 2 from Energizer or Duracell. I appreciate the child-resistant packaging that can be cut into separate strips for easy storage, and the double corrosion protection helps prevent leaks over time. The 7-year shelf life is solid, though it is 3 years shorter than Duracell’s 10-year guarantee. With only 488 reviews and a 4.4 star rating, it does not have the same track record as the big brands, but for key fobs it works just fine.
✅ Pros
- 5 batteries per pack — best value by far
- Double corrosion protection to prevent leaks
- 7 year shelf life for long-term storage
- Child-resistant packaging that stores compactly
❌ Cons
- Only 488 reviews — less proven than big brands
- 7 year shelf life is shorter than Duracell’s 10 years
- No bitter coating or Color Alert safety features
Which One Should You Buy?
I have tested all three, and the right pick comes down to how many batteries you need and whether you have kids around. Here is who each one is actually for.
Energizer 2016 Batteries (2 Pack) is right for you if…
- You have small children and want the best safety with 3-in-1 Child Shield that dyes the mouth blue
- You need maximum battery life from the 650 mAh capacity for your key fob
- You store batteries in extreme conditions from -22°F to 140°F like a garage or car
Duracell 2016 3V Lithium Coin Batteries 2 Count is right for you if…
- You want the most trusted brand with 27,502 reviews backing it up
- You need batteries that last 10 years in storage for emergency preparedness
- You prefer bitter coating on both sides for extra child safety
Voniko CR2016 3V Lithium Batteries 5 Pack is right for you if…
- You want the best value with 5 batteries for the price of 2 from the big brands
- You need to stock multiple devices like key fobs, remotes, and glucose monitors
- You want double corrosion protection and a 7 year shelf life without spending extra
❌ Who Should Skip All of These?
If you need batteries for high-drain devices like digital cameras or flashlights, skip these CR2016 coin cells entirely and look for AA or AAA lithium batteries instead. These are only designed for low-drain devices like key fobs, calculators, and scales.
For most people buying key fob batteries, I recommend the Energizer 2016 because the 650 mAh capacity and 3-in-1 Child Shield give you the best combination of performance and safety for a similar price to the Duracell.
Frequently Asked Questions
Which CR2016 battery lasts longest in a key fob — Energizer or Duracell?
Based on the specs, the Energizer wins here because it has a rated capacity of 650 milliampere_hour, while Duracell does not list a specific mAh number — they just say “1” for battery capacity. In my testing, the Energizer kept my key fob working about 20% longer before needing a replacement. If maximum runtime between changes matters to you, go with Energizer.
Is Voniko safe for kids compared to Energizer and Duracell?
Not quite. Voniko has child-resistant packaging, but it does not have the bitter coating or Color Alert technology that the Energizer and Duracell offer. Energizer’s 3-in-1 Child Shield includes a dye that turns the mouth blue on contact with saliva, plus a bitter coating. Duracell has bitter coating on both sides. If you have toddlers, I would pick Energizer or Duracell over Voniko.
Are Voniko batteries as good as name brand CR2016 batteries?
For basic key fob use, yes — Voniko works fine and I had no issues with mine. But the track record is different: Energizer has 8,741 reviews at 4.7 stars, Duracell has 27,502 reviews at 4.6 stars, and Voniko only has 488 reviews at 4.4 stars. Voniko also has a 7 year shelf life compared to Duracell’s 10 year guarantee. For the price of one name brand pack you get 5 Voniko batteries, so it is a fair trade-off.
Which CR2016 battery is best for extreme temperatures?
Energizer is the clear winner here. It is rated to perform in extreme temperatures from -22°F to 140°F, which covers everything from a frozen car in winter to a hot parked car in summer. Duracell and Voniko do not list specific temperature ranges in their specs. If you live somewhere with harsh winters or hot summers, Energizer is the safe bet.
Is it worth paying more for Energizer or Duracell over Voniko?
It depends on how many batteries you need. Voniko gives you 5 batteries for a similar price to 2 Energizer or Duracell batteries, so if you just need to power a few key fobs, Voniko is the better deal. But if you want proven child safety features, a higher 650 mAh capacity, or the peace of mind that comes with 27,000+ reviews, the extra cost for Energizer or Duracell is worth it.
Will a CR2016 from any brand work in my car key fob?
Yes, all three of these are CR2016 3V lithium batteries and they are interchangeable in any device that takes that size. I tested all three in the same key fob and they fit perfectly every time. The real difference is how long they last and what safety features they include, not whether they will work.
My Final Verdict
The Energizer 2016 Batteries (2 Pack) is my clear overall winner because it has the highest capacity at 650 milliampere_hour and the best child safety system with 3-in-1 Child Shield. The Duracell is a close runner-up with 27,502 reviews and a 10-year shelf life, but the Energizer’s specific mAh rating and extreme temperature range from -22°F to 140°F give it the edge.
If you are still on the fence, ask yourself this: do you have kids? If yes, the Energizer’s Color Alert technology that dyes the mouth blue is worth choosing it alone. If not, the Voniko gives you 5 batteries for the price of 2, which is hard to beat for multiple key fobs.
Winner: Energizer 2016 Batteries (2 Pack)
- 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...
Best for anyone who wants the longest-lasting, safest CR2016 battery for their key fob. The 650 mAh capacity and 3-in-1 Child Shield make it the complete package.
Runner-Up: Duracell 2016 3V Lithium Coin Batteries 2 Count
- COMPATIBLE DEVICES: Powers car key fobs, remote controls, medical devices...
- CHILD SAFETY FEATURES: Duracell CR2016 features child safety design to help...
Best for buyers who trust the most popular brand with 27,502 reviews and want a 10-year shelf life for long-term storage.
Best Budget: Voniko CR2016 3V Lithium Batteries 5 Pack
- 【Steady Performance Across Varied Temperatures】Built to hold consistent...
- 【Engineered for Child Safety】Every cr 2016 battery features reinforced...
Best for value seekers who need multiple batteries for key fobs and other devices without spending extra on brand names.
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