Index / 337
337
337 — silver oxide, 1.55 V, 4.8 x 1.6 mm. Current, and nothing else in the data shares its size.
Nothing else in the data is this size
Nothing else in the data is 4.8 x 1.6 mm. This cell has the shell to itself, which means a device built around it has no second source: the search for a replacement starts by changing the compartment, not the cell.
What a watch movement does with this cell
A quartz movement pulls a short pulse through the cell every second and reads the voltage between pulses. That is why the chemistry in this envelope matters more than the size does. Silver oxide holds 1.55 V nearly flat until it is spent.
Internal impedance 40 to 70 ohms, published by the maker. That is the figure the stepper motor pulse sees, and it rises as the cell ages. Energizer files it for Asia Pacific, Europe, Latin America and North America, which is where the part is sold rather than where the cell will work. The maker still lists it, under 1 product line: 337.
Drawn to scale
337, side elevation, from the published figures
Every published figure
Every field the maker fills is filled for this one: 11 figures in all, from chemistry through to where it is sold.
| Designation | 337 |
|---|---|
| Chemistry | Silver Oxide |
| Nominal voltage | 1.55 V |
| Diameter | 4.8 mm |
| Height | 1.6 mm |
| Weight | 0.1 g |
| Volume | 0.03 cc |
| Capacity | 8.3 mAh to 1.2 V |
| Stored energy | 13 mWh |
| Energy density | 429 mWh per cc |
| Impedance | 40 to 70 ohms |
| In the Energizer catalog | Listed |
| Listed for | Asia Pacific, Europe, Latin America, North America |
2 rows in the table are not the maker's but ours: stored energy and energy per cubic centimeter. Everything else is reproduced without change.
The number a pulse sees
Energizer publishes an impedance band of 40 to 70 ohms for 337. It is the least quoted number on the sheet and the one that decides whether the cell can drive a pulse; 3 other published figures sit below.
The part occupies 0.03 cubic centimeters and weighs 0.1 g. Capacity and voltage together put 13 milliwatt-hours in that space. Energizer files it for Asia Pacific, Europe and Latin America.
- Internal impedance
- 40 to 70 ohms as published. A high-impedance cell sags under a pulse and recovers between pulses, which is what a movement or a sensor sees.
- Cutoff voltage
- 1.2 V. The published capacity is counted down to this voltage; a device that quits higher up sees less than the whole figure.
- Mass against volume
- 0.1 g filling 0.03 cubic centimeters. When the printing has worn off, a kitchen scale separates two cells of one envelope faster than a caliper does.
- Where the part is filed
- Asia Pacific, Europe, Latin America and North America. That is a statement about the maker's distribution and not about where the cell works.
Is that a lot of energy?
Nothing else measured shares this shell, so the comparison has to go site-wide: 13 milliwatt-hours in 0 cubic centimeters is 429 mWh per cc, denser than 70% of every cell measured here. Density is ours: the maker publishes capacity and volume and never divides one by the other.
A width almost nothing else uses
4.8 mm is a width almost nothing else uses. 0 coins sit within half a millimeter of it in the Energizer data this site reads, which is why the near misses below are measured rather than listed.
Its 429 milliwatt-hours per cubic centimeter sit above 70 percent of everything here that publishes both a capacity and a volume. 32 of the 82 coins share its 1.55 V exactly.
- 333 — the next step up: 0.038 cubic centimeters, 127% of this one.
Nothing else is stamped on this one
Nothing else is printed on 337 in the Energizer data this site reads: one designation, no trade marking, no maker's part number, and no long form in the standard's table. A cell measuring 4.8 x 1.6 mm carries its whole identity in 3 characters.
Near the same width, and not the same cell
No other cell in the Energizer data this site reads measures this exactly, so the confusions are the near misses: 6 cells sit within a millimeter of this cell's 4.8 mm and do not fit its holder.
It stands 1 of 1 in this envelope by stored energy. On a scale the difference shows before it shows on a caliper: this one weighs 0.1 g.
- 1191SO — 5.8 mm across at 1.55 V against 4.8 mm here, 1 mm apart: too wide to enter in this holder.
- 317 — 5.8 mm across at 1.55 V against 4.8 mm here, 1 mm apart: too wide to enter in this holder.
One figure the maker does not publish
One field is empty for 337: operating temperature. A blank means the maker publishes no figure, which is not the same as zero, and it is the reason one comparison below is missing rather than wrong.
The blanks are the same in all 2 records behind this designation, so they are the catalog's silence and not a merge losing a value. What is not missing is the envelope: 4.8 x 1.6 mm, published and checked against the designation itself.
- No operating temperature — so this page cannot tell you whether the maker claims anything at all below freezing.
Before you swap anything
Everything here is computed from published dimensions and nominal voltages. That answers whether a cell enters the compartment and whether the voltage matches on paper. It does not answer what your device does with the difference, and it cannot: a cell that fits can still be the wrong cell.
One more limit, and it is the biggest. This site reads a single manufacturer’s catalog. When a page says a designation is not listed, that means Energizer no longer offers a part under it — not that nobody makes the cell. Other makers may still sell it, and for common sizes they usually do.
A voltage difference is one relation between two cells, and this page prints it from the cell it is about — in every table on the page, including the one listing cells no longer made. A figure always belongs to the cell whose voltage is printed beside it: a cell that runs lower than this one carries a minus here, one that runs higher carries a plus, and two cells at the same nominal voltage carry zero. Meet the same pair on the other cell’s page and the sign is the other one, with the figure taken against that cell instead of this one; where the two run at the same voltage, both pages print zero. The class beside the figure is not read off that figure directly. It is decided on the gap itself, taken against the higher of the two nominal voltages, so one pair of cells gets one class whichever page you meet it on: counted from this side the boundary of the class that still runs falls at 20.0% below and 25.0% above, which is the same gap divided once by the larger nominal and once by the smaller. What genuinely differs between the two directions is the consequence, and the words carry it: a cell that runs low makes a calibrated instrument read below true, and a cell that runs high makes it read above.
3 things this site cannot see. Whether the contacts reach a shorter cell. Whether the device was calibrated for a chemistry that holds its voltage flat, which silver oxide does and alkaline does not. Whether the equipment tolerates the higher current a different chemistry can deliver. Rechargeable cells are never a drop-in for primary cells regardless of size.
Where these numbers come from
Dimensions, voltages, chemistries and capacities are published by the manufacturer and reproduced without change. Everything else on the page is ours, computed from those figures: whether one cell fits where another sat, how far apart their voltages are, stored energy and energy per cubic centimeter, the rank within a shell, and the check of the designation against the measured size.
Fit is decided within 0.3 mm on every axis, which is the order of a contact spring's travel. Voltage classes are decided by consequence, not by roundness, and they are decided on the gap between two nominal voltages taken against the higher of the two: 2.0% or less of it is the same working voltage, 6.0% starts to matter to a calibrated instrument, and past 20.0% it is a different class altogether. Measuring the gap against the higher figure is what makes the verdict the same from either cell’s page, while the printed percentage stays counted from the cell you are reading about. Cells with identical stored energy share a rank instead of being ordered arbitrarily.
Ranking uses capacity times nominal voltage, because capacity alone is not comparable across chemistries: 150 mAh at 3 V is twice the energy of 150 mAh at 1.5 V. Neighbors are chosen by measurement and never alphabetically, because two cells filed next to each other by name usually have nothing in common. A blank in any table means the maker publishes no figure, which is not the same as zero.
Source: Energizer technical data, retrieved 1 September 2026.
Records that disagree behind this page
337 is assembled from 2 catalog records, and they do not agree with each other on every field. Both sides are numbered below so the disagreement can be read rather than taken on trust.
- [1] Energizer catalog record 108, active in the snapshot. Technical data sheet: 337z.pdf.
- [2] Energizer catalog record 479, obsolete in the snapshot. Technical data sheet: 337.pdf.
Every figure above is reproduced from those records without change; the comparisons are ours and are described on the method page. Snapshot: Energizer technical data, retrieved 1 September 2026.
Putting this on a forum or a repair page? The same answer without the site around it — fit, voltage, chemistry and the limits that go with them — is at /embed/337/. It loads nothing from anywhere else. Paste this:
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