Index / 3-0316I
3-0316I
3-0316I — alkaline, 1.5 V, 8.2 x 39.8 mm, known as an AAAA cell. Not listed by Energizer, and nothing it still lists is the right voltage class for this compartment: A27 goes in and stands shorter, and runs 12 V — +700%, a higher voltage class. Not a substitute.
What fits the compartment, and what does not
Fit answers whether it enters the compartment. Voltage answers whether the circuit will notice. A cell that fits is not always a safe substitute.
| Cell | Fit | Voltage | Chemistry | Capacity |
|---|---|---|---|---|
| A27 | sits lower | 12 V +700%wrong class | alkaline | 22 mAh |
| LR8D425 | too tall | 1.5 V 0%same volts | alkaline | 625 mAh |
Nothing Energizer still lists is the same depth. The 2 options below share the diameter and run 28.2 to 42.5 mm against this cell's 39.8, and some are shallower and some deeper, so read the depth column: short of this cell is a contact problem, past it is a cover problem.
The axis is the difference from this cell, not a range of volts: the centre is 1.5 V and the ruled middle is the class where a substitute still runs and only reads off — a gap within 20.0% of the higher of the two nominals, which counted from this cell reaches 20.0% below and 25.0% above. One gap, two readings: the other cell’s page prints the other figure for this same pair and lands on the same class. Outside those two rules the class changes. The middle is drawn straight and the outer fifth of each side is compressed, so +700% puts the mark in one place here and in the same place on every other page of this site.
Unlisted, and nothing that fits is the right class
Energizer no longer lists 3-0316I, and nothing listed that fits the compartment is the right voltage: A27 goes in and stands shorter, but it runs 12 V against this cell's 1.5 V — 700% away, a higher voltage class altogether. A device built for this cell is not built for that one, and the compartment accepting it says nothing about the circuit surviving it.
The household slot this size sits in
3-0316I is an AAAA, which is a shape rather than a specification: 3 designations share the same slot in the Energizer data this site reads under different chemistries. This one is alkaline at 625 mAh. Across the AAAA the published capacity runs from 625 mAh (LR8D425) to 625 mAh (3-0316). 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. 2 cells measure close enough to compare against it in the Energizer data this site reads, and 2 of them are still listed. The nearest is A27: it enters and sits lower and runs 12 V, wrong class.
- Energizer files it for North America, which is where the part is sold rather than where the cell will work.
- Energizer no longer lists 3-0316I at all, so whatever goes into that compartment next will be a substitution rather than a replacement.
Drawn to scale
3-0316I, side elevation, from the published figures
The same scale for all of them. The dashed line marks the height of 3-0316I: 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
10 figures are published, and one is not: impedance. The row is absent rather than estimated. It reached shelves as 3-0316I.
| Designation | 3-0316I |
|---|---|
| Chemistry | Alkaline |
| Nominal voltage | 1.5 V |
| Diameter | 8.2 mm |
| Height | 39.8 mm |
| Weight | 6.2 g |
| Volume | 2.1 cc |
| Capacity | 625 mAh to 0.8 V |
| Stored energy | 938 mWh |
| Energy density | 446 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.
Where the capacity figure stops counting
A capacity figure means nothing without the voltage it was counted to. For 3-0316I the maker counts down to 0.8 V, and 2 published figures sit beside it.
The part occupies 2.1 cubic centimeters and weighs 6.2 g. Capacity and voltage together put 938 milliwatt-hours in that space. Energizer files it for North America.
- 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.
- Mass against volume
- 6.2 g filling 2.1 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
- 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: 938 milliwatt-hours in 2.1 cubic centimeters is 446 mWh per cc, denser than 73% of every cell measured here. Density is ours: the maker publishes capacity and volume and never divides one by the other.
A width the catalog keeps returning to
8.2 mm is a width this catalog keeps coming back to: 3 cylinders sit within half a millimeter of it, 3-0316I included.
2 of those ones are still listed. Its 446 milliwatt-hours per cubic centimeter sit above 73 percent of everything here that publishes both a capacity and a volume. 36 of the 69 cylinders share its 1.5 V exactly.
- 3-0316 — the next step down by volume: 1.9 cubic centimeters against this cell's 2.1.
- LR8D425 — the next step up: 2.2 cubic centimeters, 105% of this one.
- LR8D425 — 8.3 x 42.5 mm, 1.5 V, alkaline.
- 3-0316 — 7.8 x 39.8 mm, 1.5 V, alkaline.
Nothing else is stamped on this one
Nothing else is printed on 3-0316I 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 8.2 x 39.8 mm carries its whole identity in 7 characters.
The cell that differs only in depth
The code says the size, so the cells that get confused with 3-0316I are the ones that keep its diameter and change its depth. 2 cells share this diameter at depths from 28.2 to 42.5 mm, and every one of them enters the same opening.
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 6.2 g.
- A27 — same diameter, 28.2 mm tall against this cell's 39.8: 11.6 mm shallower, which neither designation carries.
- LR8D425 — same diameter, 42.5 mm tall against this cell's 39.8: 2.7 mm deeper, which neither designation carries.
- 3-0316 — 7.8 mm across at 1.5 V against 8.2 mm here, 0.4 mm apart: loose in this holder.
What this page cannot tell you
2 of the 7 fields this site reads are empty for 3-0316I: impedance and operating temperature. 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: 8.2 x 39.8 mm, published and checked against the designation itself.
- 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.
- 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.
Cells measured next to this one
Nothing in the Energizer data on this site shares this exact size. The 2 cells below have the same diameter and a different depth — 28.2 to 42.5 mm against this cell's 39.8 — which is a near miss rather than an alternative.
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 387, and it is linked below. The sheet is the document the dimensions, voltage and capacity were read out of.
- [1] Energizer catalog record 387, obsolete in the snapshot. Technical data sheet: 3-0316i.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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