Index / LR8D425

LR8D425

LR8D425 — alkaline, 1.5 V, 8.3 x 42.5 mm, known as an AAAA cell. Current, and nothing else in the data shares its size.

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.

Nothing Energizer still lists is the same depth. The one option below shares the diameter and stands 28.2 mm against this cell's 42.5, and every one of them is shallower, so each stands off the contact by the difference — a spring may take that up and a flat tab will not.

Also stamped 25A, E96, E96E2

The most capacity this size is made in

2 other designations in this size hold the same 625 mAh, so the highest capacity the size is made in is shared rather than held. What separates them is chemistry and price, not running time. The same cell is stamped 25A, E96 and E96E2 depending on who made it.

The household slot this size sits in

LR8D425 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 (3-0316) to 625 mAh (3-0316I). 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. 1 cell measures close enough to compare against it in the Energizer data this site reads, and 1 of it is still listed. The nearest is A27: it enters and sits lower and runs 12 V, wrong class.

• 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 3 product lines: E96, E96e2 and LR8D425.

Drawn to scale

Every published figure

11 figures are published, and one is not: impedance. The row is absent rather than estimated. It reaches shelves as E96, E96e2 and LR8D425.

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 LR8D425 carries an operating range as well as a capacity, and it reaches -18 C (-0 F) at the cold end. 4 more published figures follow it, and none of them reaches a cross-reference table.

The part occupies 2.2 cubic centimeters and weighs 6.5 g. Capacity and voltage together put 938 milliwatt-hours in that space. Energizer files it for Asia Pacific, Europe and Latin America.

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.

Maker's classification

Alkaline. That is the maker's own filing word for the part, not a standard designation.

Mass against volume

6.5 g filling 2.2 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: 938 milliwatt-hours in 2.2 cubic centimeters is 426 mWh per cc, denser than 69% 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

8.3 mm is a width this catalog keeps coming back to: 3 cylinders sit within half a millimeter of it, LR8D425 included.

1 of those one is still listed. Its 426 milliwatt-hours per cubic centimeter sit above 69 percent of everything here that publishes both a capacity and a volume. 36 of the 69 cylinders share its 1.5 V exactly.

• 3-0316I — the next step down by volume: 2.1 cubic centimeters against this cell's 2.2.
• 4RN43 — the next step up: 2.3 cubic centimeters, 105% of this one.
• 3-0316 — 7.8 x 39.8 mm, 1.5 V, alkaline.
• 3-0316I — 8.2 x 39.8 mm, 1.5 V, alkaline.

The maker's own part numbers

LR8D425 carries 3 names beyond the designation, and every one of them is a manufacturer part number: a catalog line, not a size and not a standard.

• 25A — a manufacturer part number for LR8D425, not a standard designation.
• E96 — a manufacturer part number for LR8D425, not a standard designation.
• E96E2 — a manufacturer part number for LR8D425, not a standard designation.
• The maker's own catalog carries 3 product lines under it.

The cell that differs only in depth

The code says the size, so the cells that get confused with LR8D425 are the ones that keep its diameter and change its depth. 2 cells share this diameter at depths from 28.2 to 39.8 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 6.5 g.

• A27 — same diameter, 28.2 mm tall against this cell's 42.5: 14.3 mm shallower, which neither designation carries.
• 3-0316I — same diameter, 39.8 mm tall against this cell's 42.5: 2.7 mm shallower, which neither designation carries.
• 3-0316 — 7.8 mm across at 1.5 V against 8.3 mm here, 0.5 mm apart: loose in this holder.

One figure the maker does not publish

One field is empty for LR8D425: impedance. 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 3 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: 8.3 x 42.5 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.

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 39.8 mm against this cell's 42.5 — which is a near miss rather than an alternative.

• A27 — 8 x 28.2 mm, 12 V
• 3-0316I — 8.2 x 39.8 mm, 1.5 V

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

LR8D425 is assembled from 3 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. [1] Energizer catalog record 267, listed as E96, active in the snapshot. Technical data sheet: e96gl1020.pdf.
2. [2] Energizer catalog record 784, listed as E96e2, obsolete in the snapshot. Technical data sheet: e96e2.pdf.
3. [3] Energizer catalog record 1233, active in the snapshot. Technical data sheet: lr8d425pl_eu.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/lr8d425/. It loads nothing from anywhere else. Paste this:

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