Index / 3-361I
3-361I
3-361I — alkaline, 1.5 V, 32.9 x 87.8 mm, known as an F cell. Not listed by Energizer, and nothing in its catalog shares this size.
Unlisted, and nothing in the catalog is this size
Energizer no longer lists a part under 3-361I, and its catalog holds nothing else at 32.9 x 87.8 mm. That is the honest answer: an alkaline cell of this exact size is not something you can buy, and the closest options change either the depth or the voltage.
The household slot this size sits in
3-361I is an F, which is a shape rather than a specification: 2 designations share the same slot in the Energizer data this site reads under different chemistries. This one is alkaline at 26000 mAh. Across the F the published capacity runs from 26000 mAh (3-361) to 26000 mAh (3-361). The compartment does not change; the run time changes by 1.0x.
An alkaline cell left in a device it is not powering is the commonest way this size ruins equipment: the leak happens on the shelf, not under load. Energizer files it for North America, which is where the part is sold rather than where the cell will work. Energizer no longer lists 3-361I at all, so whatever goes into that compartment next will be a substitution rather than a replacement.
Drawn to scale
3-361I, side elevation, from the published figures
The same scale for all of them. The dashed line marks the height of 3-361I: a silhouette that stops short of it will not reach the contact, one that crosses it will not let the cover close.
Every published figure
9 figures are published and 2 fields left blank, among them weight and impedance. It reached shelves as 3-361I. A blank is not a zero.
| Designation | 3-361I |
|---|---|
| Chemistry | Alkaline |
| Nominal voltage | 1.5 V |
| Diameter | 32.9 mm |
| Height | 87.8 mm |
| Volume | 74.8 cc |
| Capacity | 26000 mAh to 0.8 V |
| Stored energy | 39000 mWh |
| Energy density | 521 mWh per cc |
| In the Energizer catalog | No longer listed |
| Listed for | 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.
What the maker says about cold
The sheet for 3-361I carries an operating range as well as a capacity, and it reaches -18 C (-0 F) at the cold end. 2 more published figures follow it, and none of them reaches a cross-reference table.
- Operating range
- -18 C (-0 F) to 55 C (131 F). Below the lower figure the maker makes no claim at all, which is not the same as the cell stopping.
- Cutoff voltage
- 0.8 V. The published capacity is counted down to this voltage; a device that quits higher up sees less than the whole figure.
- Where the part is filed
- 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: 39000 milliwatt-hours in 74.8 cubic centimeters is 521 mWh per cc, denser than 87% of every cell measured here. Density is ours: the maker publishes capacity and volume and never divides one by the other.
The largest thing of its shape here
Nothing else shaped like this is larger in the Energizer data this site reads. At 74.8 cubic centimeters 3-361I tops the 70 cylinders the snapshot measures.
0 of those ones are still listed. Its 521 milliwatt-hours per cubic centimeter sit above 87 percent of everything here that publishes both a capacity and a volume. 36 of the 69 cylinders share its 1.5 V exactly.
- 1.2H4 — the next step down by volume: 57 cubic centimeters against this cell's 74.8.
- 3-350WC — 33.2 x 61.5 mm, 1.5 V, alkaline.
Nothing else is stamped on this one
Nothing else is printed on 3-361I 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 32.9 x 87.8 mm carries its whole identity in 6 characters.
The cell that differs only in depth
The code says the size, so the cells that get confused with 3-361I are the ones that keep its diameter and change its depth. 1 cell shares this diameter at 61.5 mm, and every one of them enters the same opening.
- 3-350WC — same diameter, 61.5 mm tall against this cell's 87.8: 26.3 mm shallower, which neither designation carries.
- 3-350I — 34.1 mm across at 1.5 V against 32.9 mm here, 1.2 mm apart: too wide to enter in this holder.
- 3-350IWC — 34.1 mm across at 1.5 V against 32.9 mm here, 1.2 mm apart: too wide to enter in this holder.
- It stands 1 of 1 in this envelope by stored energy.
What this page cannot tell you
2 of the 7 fields this site reads are empty for 3-361I: mass and impedance. Everything computed from them is absent from this page rather than estimated.
The blanks are the same in all 1 record behind this designation, so they are the catalog's silence and not a merge losing a value. What is not missing is the envelope: 32.9 x 87.8 mm, published and checked against the designation itself.
- No mass — so this page cannot tell you energy per gram, and the one check that separates two cells of one envelope when the printing has worn off.
- No impedance — so this page cannot tell you whether the cell can drive a pulse, which is the whole question in a watch or a sensor.
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.
The record behind this page
Every figure on this page comes from one catalog record, number 476, and it is linked below. The sheet is the document the dimensions, voltage and capacity were read out of.
- [1] Energizer catalog record 476, obsolete in the snapshot. Technical data sheet: 3-361i.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.
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