3 V Li/MnO2 coin
CR2012
BuyCR2012Lithium (CR) · 3 V · 20.0 × 1.2 mm
Can I use one of these instead?
3 V · 20 × 1.2 mm · Lithium manganese dioxide coin
CR2012 is a listed designation for this lithium manganese dioxide coin cell, 3 V, 20 × 1.2 mm. Figures below are copied from the datasheets and charts linked at the bottom.
| Chemistry | Lithium manganese dioxide coin |
|---|---|
| Nominal voltage | 3 V |
| Diameter × height | 20 × 1.2 mm Panasonic September 2022 lineup, nominal diameter and height. |
| Designation on the datasheet | IEC-CR2012 |
| Weight | Panasonic about 1.4 g |
Size check at real size
Lay the old cell on the outline. This shows the top outline (diameter) and the side outline (height) at 1:1 once the screen is calibrated.
CR2012 outline, 20 × 1.2 mm. Not a photograph, drawn from the figures above.
Calibrate this screen
Screens scale pages differently, so true size is only true after calibration. Hold a bank card or ID card (85.60 mm wide, ISO/IEC 7810 ID-1) against the bar and slide until the bar is exactly as wide as the card.
Saved in this browser only.
All cells on one true-size sheet
When printing, set scale to 100% or Actual size, not Fit to page.
Capacity
| Source | mAh | Test as printed |
|---|---|---|
| Panasonic | 55 | Nominal capacity. Continuous standard drain 0.1 mA. September 2022 lineup. |
Devices named on the Energizer guide
Medical devices, key fobs, remotes, toys, games. See car key fobs, medical devices, garage openers, remotes and doorbells, toys, games and books.
Lithium manganese dioxide coin cells
A CR coin is a lithium/manganese dioxide primary cell. Panasonic's industrial catalog shows how the number is built: C is that chemistry, R means round, the next two digits are the diameter in millimetres, and the last two are the height in tenths of a millimetre. CR2032 is a 20 mm cell, 3.2 mm thick. CR2025 is the same diameter and 2.5 mm thick. CR2016 is 1.6 mm thick. The voltage does not change with the thickness. Energizer's CR2032 and CR2025 sheets both print a nominal 3.0 V, and Panasonic's standard CR line does too. What changes is how much lithium fits in the can, and whether the cell can reach the contact spring.
That is the whole of the CR2032-versus-CR2025 question. A 2025 will sit in a 2032 holder and rattle. The spring may still touch it on the bench and then drop out in a pocket. A 2032 will not go into a holder machined for 2.5 mm. Do not stack two thinner cells to fake the thickness, and do not add a shim of foil. Match the height printed on the dead cell.
Capacity is a test result, not a property of the four-digit code. Energizer rates its CR2032 at 235 mAh to 2.0 V on a 15 kΩ load at 21°C. Panasonic rates its CR2032 at 225 mAh. Those are both real, and they are not interchangeable as a single 'typical' figure. The page for each size lists the brand ratings we could read off a datasheet. Where a brand is missing, that brand has not been assigned a number here.
Energizer's coin sheets also carry a swallow warning. A lithium coin lodged in the oesophagus can burn through tissue in about two hours. Holders should need a tool, or two deliberate motions, to open. That is a design requirement on the datasheet, not a slogan.
Sources
Last verified 2026-10-29.
- Panasonic coin-type lithium batteries lineup, September 2022 Panasonic Energy, checked 2026-10-29
- Panasonic industrial battery catalog (model-number example and BR series title) Panasonic Energy, checked 2026-10-29