Index / Shell 68.2 x 68.2 x 115 mm / 4R25X
4R25X
4R25X — carbon zinc, 6 V, 68.2 x 68.2 x 115 mm, known as a Lantern cell. Not listed by Energizer. The closest it still lists: 4LR25X drops straight in, and runs 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.
| Cell | Fit | Voltage | Chemistry | Capacity |
|---|---|---|---|---|
| 4LR25X | drop-in | 6 V 0%same volts | alkaline | — |
| 4R25 | drop-in | 6 V 0%same volts | carbon zinc | — |
2 cells drop in, spanning alkaline and carbon zinc. They fit the same hole; what separates them is how they hold voltage as they empty.
Also stamped 908CD, EV190
Unlisted, but something drops straight in
4R25X (also 908CD) has left the Energizer catalog, but the swap is easy: 4LR25X is the same 68.2 x 68.2 x 115 mm and runs at 6 V against this cell's 6 V. 1 other current cell fits the same slot.
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. 4R25X delivers 6 V, and the case is the only part a compartment measures.
4LR25X and 4R25 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.
- 2 cells measure close enough to compare against it in the Energizer data this site reads, and 2 of them are still listed.
- Energizer files it for North America, which is where the part is sold rather than where the cell will work.
- Energizer no longer lists 4R25X at all, so whatever goes into that compartment next will be a substitution rather than a replacement.
Drawn to scale
4R25X, side elevation, from the published figures
The same scale for all of them. The dashed line marks the height of 4R25X: 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
Capacity is missing here, and with it every figure derived from capacity: 11 figures are published, 4 fields are not.
| Designation | 4R25X |
|---|---|
| Also stamped | 908CD, EV190 |
| Chemistry | Carbon Zinc |
| Nominal voltage | 6 V |
| Length | 68.2 mm |
| Width | 68.2 mm |
| Height | 115 mm |
| Weight | 589 g |
| Volume | 480 cc |
| In the Energizer catalog | No longer listed |
| Listed for | North America |
What the maker says about cold
The sheet for 4R25X 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.
- Mass against volume
- 589 g filling 480 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?
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, 4R25X included.
- 30R6 — the next step down by volume: 469 cubic centimeters against this cell's 480.
- 4R25 — the next step up: 492 cubic centimeters, 102% of this one.
- 7 of the 50 boxes share its 6 V exactly.
The maker's own part numbers
4R25X carries 2 names beyond the designation, and every one of them is a manufacturer part number: a catalog line, not a size and not a standard.
- 908CD — a manufacturer part number for 4R25X, not a standard designation.
- EV190 — a manufacturer part number for 4R25X, not a standard designation.
The identical cell with different insides
Nothing about the outside of 4R25X 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 589 g.
What this page cannot tell you
3 of the 7 fields this site reads are empty for 4R25X: capacity, cutoff voltage 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: 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.
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 880, and it is linked below. The sheet is the document the dimensions, voltage and capacity were read out of.
- [1] Energizer catalog record 880, listed as EV190, obsolete in the snapshot. Technical data sheet: ev190.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/4r25x/. It loads nothing from anywhere else. Paste this:
<iframe src="https://batterycross.com/embed/4r25x/" width="100%" height="520" loading="lazy" title="4R25X replacements"></iframe>