A 2032 battery is a 20mm-diameter, 3.2mm-thick lithium coin cell rated at 3.0 volts, sold under model names CR2032, DL2032, and ECR2032 depending on the manufacturer. The numbers in the name are the actual dimensions in millimetres, not a marketing code, and that is the fastest way to check whether a swap will fit.
What CR2032, DL2032, and ECR2032 Actually Mean
Coin cells follow an IEC naming convention. The first two digits give the diameter in millimetres, the last two give the thickness in tenths of a millimetre. A 2032 cell is 20.0mm across and 3.2mm thick, per Energizer’s own datasheet for its CR2032.
The letters in front change by brand, not by size. Duracell sells the identical dimension as the DL2032, Energizer as the ECR2032. Both are lithium manganese dioxide chemistry, rated 3.0 volts nominal, and both fit the same holder.
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The Sizes That Look Like a 2032 But Are Not
CR2025 and CR2016 share the same 20mm diameter as a 2032 cell, so they physically drop into the same holder. They are not the same battery. Thickness sets capacity, and the gap is large enough to matter in a smoke detector or a key fob that expects a full charge.
Energizer’s datasheets put the CR2032 at 240 mAh, the CR2025 at 170 mAh, and the CR2016 at 100 mAh, each rated to a 2.0-volt cutoff. A CR2016 swapped in for a CR2032 will run, then quit at roughly 40 percent of the runtime.
| Model | Diameter x Thickness | Typical Capacity | Weight |
|---|---|---|---|
| CR2032 | 20.0mm x 3.2mm | 240 mAh | 3.0g |
| CR2025 | 20.0mm x 2.5mm | 170 mAh | 2.6g |
| CR2016 | 20.0mm x 1.6mm | 100 mAh | 1.9g |
Before assuming a dead device just needs a fresh 2032 cell, check whether the old one is actually flat. A battery tester that reads under load rather than open-circuit voltage catches coin cells that read fine sitting idle but collapse once a circuit draws current from them.
Coin cells are not rechargeable, unlike the packs covered in solar battery chargers built to trickle-maintain larger battery banks. A rechargeable lookalike sold as LIR2032 runs 3.6 volts, not 3.0, and can damage a device built only for a single-use lithium cell.
The Child Safety Warning Now Printed on Every Pack
Reese’s Law (P.L. 117-171), signed in 2022, forced new federal rules on button and coin batteries after ingestion injuries in young children. The Consumer Product Safety Commission’s own hazard language for the CR2032 is blunt: swallowing can cause serious injury or death in as little as two hours, from chemical burns as the battery reacts with saliva.
Battery packaging has needed child-resistant closures since February 12, 2023, under 16 CFR 1700.15. Devices with replaceable coin cells have had to secure the compartment behind a tool or two independent, simultaneous hand movements since March 19, 2024, under 16 CFR part 1263.
Keep old and new batteries out of a young child’s reach during the swap, not just after it, and never store spares loose in a drawer. If one is swallowed, the CPSC directs caregivers to seek emergency care immediately rather than wait for symptoms.
The same compartment rules now apply to small remotes and key fobs, which is one reason a dash cam’s backup clock battery is harder to access on newer models than it was five years ago.
Frequently Asked Questions
Is a 2032 battery the same as a CR2032?
Yes. “2032” is the dimension code (20.0mm by 3.2mm). CR2032 adds the chemistry prefix that most manufacturers use for that size.
Can I use a CR2025 instead of a CR2032?
It will physically fit but holds roughly 30 percent less capacity per Energizer’s datasheets, so runtime drops. Use it only as a short-term stand-in, not a permanent replacement.
Why do CR2032 packs look different than they did a few years ago?
Reese’s Law added mandatory child-resistant packaging and warning labels starting in 2023 and 2024, which is why blister packs now need scissors or a harder pull to open.
Marcus Reid writes about gaming, streaming platforms, and digital tools for 3Zebras. A lifelong gamer with over 8 years of experience in games journalism, Marcus covers everything from Roblox codes and Blooket strategies to PC gaming mods and console comparisons. He tests every game and app he reviews firsthand and focuses on practical guides that help readers get more out of their favorite platforms. Outside of gaming, Marcus covers IPTV services, streaming devices, and cord-cutting solutions for budget-conscious users.