Index / Shell 68.2 x 68.2 x 115 mm / 4R25

4R25

4R25 — carbon zinc, 6 V, 68.2 x 68.2 x 115 mm, known as a Lantern cell. Current. 4LR25X takes the same slot at the same 6 V.

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.

One cell matches on both counts: 4LR25X is the same size and the same 6 V. The rest of the table trades depth for availability.

Also stamped 908D, 1209, 920, 2744N, 908, 509, 915, 510S, 6, 744, EV10S, 918CD, EV131, 908C, EV90, EV90HP, HS10S, 908A

Same size, and not the same voltage

The Lantern compartment takes cells of more than one voltage. This one is 6 V; 5LR25-2 in the same size runs 7.5 V, +25.0% of this cell — high enough that a calibrated instrument reads above true. Nothing about the shape warns you, which is why the label matters more here than the size does.

What this cell can stand in for

1 designation Energizer no longer lists points at this cell as the closest thing it does list, and the voltage is the same. If a device was built for one of them, this is a straight substitution.

Every column of a row describes the discontinued cell it names. Fit reads that way too: it says whether that cell would enter this compartment, not whether this one enters its. Voltage is measured against this cell, the same way everywhere on the page: each row shows the discontinued cell’s own voltage and how far that voltage sits from this one.

What the chemistry changes

Everything above answers size and voltage. What it cannot answer is chemistry, and 1 other kind is in play here beside the carbon zinc this cell uses.

• Carbon zinc carries a fraction of the capacity of an alkaline cell of the same size and leaks more readily when spent.
• Alkaline drops in voltage steadily as it empties, so a device calibrated for a flat discharge will drift as it goes.

A multi-cell battery, not a cell

A box 68.2 x 68.2 x 115 mm is a battery in the older sense: several cells wired inside one case, with terminals on the outside and no way to look in. 4R25 delivers 6 V, and the case is the only part a compartment measures.

4LR25X and 4R25X share the same case in the Energizer data this site reads. Identical outside, and the voltage column is where they part. A pack that fits the clip can still be the wrong pack: terminal spacing and polarity are set by the case, and this site measures the case. The nearest is 4LR25X: it drops straight in and runs 6 V, same volts.

• 1 cell measures close enough to compare against it in the Energizer data this site reads, and 1 of it is still listed.
• 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 11 product lines: 1209, 2744N, 4R25 and 509.

Drawn to scale

Every published figure

Capacity is missing here, and with it every figure derived from capacity: 11 figures are published, 4 fields are not.

The maker’s records filed under this designation do not all publish the same outside size. The table prints the figure most of them carry; the rest publish a height of 97.6 mm under 2744N, 6 and 744, a height of 108.5 mm under HS10S, a height of 109.5 mm under 510S, 915 and EV10S, a height of 127 mm under 918CD and EV131, a length of 66.7 mm under 2744N, 6 and 744, a length of 136.5 mm under 918CD and EV131, a width of 66.7 mm under 2744N, 6 and 744 and a width of 73 mm under 918CD and EV131. Where the records part company the package in your hand decides, and this page cannot tell you which record it came from.

What the maker says about cold

The sheet for 4R25 carries an operating range as well as a capacity, and it reaches -18 C (-0 F) at the cold end. 3 more published figures follow it, and none of them reaches a cross-reference table.

The part occupies 492 cubic centimeters and weighs 600 g. 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.

Maker's classification

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

Mass against volume

600 g filling 492 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?

Capacity is not published for this cell, so it is absent from the energy ranking rather than placed at the bottom of it. What can be compared is size: 68.2 x 68.2 x 115 mm, against a shell that holds 3 designations.

A width the catalog keeps returning to

not published mm is a width this catalog keeps coming back to: 0 boxes sit within half a millimeter of it, 4R25 included.

• 4R25X — the next step down by volume: 480 cubic centimeters against this cell's 492.
• 152F40 — the next step up: 800 cubic centimeters, 163% of this one.
• 7 of the 50 boxes share its 6 V exactly.

The maker's own part numbers

4R25 carries 18 names beyond the designation, and every one of them is a manufacturer part number: a catalog line, not a size and not a standard.

• 908D — a manufacturer part number for 4R25, not a standard designation.
• 1209 — a manufacturer part number for 4R25, not a standard designation.
• 920 — a manufacturer part number for 4R25, not a standard designation.
• The maker's own catalog carries 11 product lines under it.

The identical cell with different insides

Nothing about the outside of 4R25 separates it from 4LR25X: the same 68.2 x 68.2 x 115 mm, and 6 V against this cell's 6 V. The label is the whole difference.

• 4LR25X — the same 68.2 x 68.2 x 115 mm in alkaline at 6 V. Identical on a caliper, different in the circuit.
• On a scale the difference shows before it shows on a caliper: this one weighs 600 g.

What this page cannot tell you

3 of the 7 fields this site reads are empty for 4R25: capacity, cutoff voltage and impedance. Everything computed from them is absent from this page rather than estimated.

The blanks are the same in all 11 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: 68.2 x 68.2 x 115 mm, published and checked against the designation itself.

• No capacity — so this page cannot tell you how long it runs, and every energy figure that depends on it.
• No cutoff voltage — so this page cannot tell you what the capacity figure was counted down to, without which the capacity is a number without a scale.
• 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

The shell is shared across chemistries: 2 cells sit at exactly this size in alkaline and carbon zinc. Same hole, different insides, different discharge curve.

• 4LR25X — 68.2 x 68.2 x 115 mm, 6 V
• 4R25X — 68.2 x 68.2 x 115 mm, 6 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

4R25 is assembled from 11 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 42, listed as 1209, active in the snapshot. Technical data sheet: 1209-1219.pdf.
2. [2] Energizer catalog record 370, listed as 2744N, obsolete in the snapshot. Technical data sheet: 2744n.pdf.
3. [3] Energizer catalog record 640, listed as 509, obsolete in the snapshot. Technical data sheet: 509.pdf.
4. [4] Energizer catalog record 643, listed as 510S, obsolete in the snapshot. Technical data sheet: 510s.pdf.
5. [5] Energizer catalog record 690, listed as 744, obsolete in the snapshot. Technical data sheet: 744.pdf.
6. [6] Energizer catalog record 862, listed as EV10S, obsolete in the snapshot. Technical data sheet: ev10s.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/4r25/. It loads nothing from anywhere else. Paste this:

<iframe src="https://batterycross.com/embed/4r25/" width="100%" height="520" loading="lazy" title="4R25 replacements"></iframe>