Index / Shells / 68.2 x 68.2 x 115 mm

68.2 x 68.2 x 115 mm

3 designations carry this exact envelope at 6 V, and 1 of them is gone from the catalog: 4R25X. What is left fits the same opening. The maker publishes no capacity for anything in this shell, so nothing here can be ranked by running time. On a shop shelf this envelope is the Lantern size, and that name is what the packet will say.

Also stamped on cells in this table: 4LR25X, 908A, 529, 529-4D, 529-4F, EN529, 4R25, 908D, 1209, 920, 2744N, 908, 509, 915, 510S, 6, 744, EV10S, 918CD, EV131, 908C, EV90, EV90HP, HS10S, 4R25X, 908CD, EV190.

The published figures agree

This page is collected by envelope, so the 3 designations here share 68.2 x 115 mm by construction. What is worth checking is that the maker publishes the same pair for each of them, and here it does: the records behind all 3 agree as printed, so nothing on this page rests on a figure one record disputes.

The compartment takes any of them; the circuit does not

2 kinds of chemistry are sold as 68.2 x 68.2 x 115 mm in this data, and the difference between them is not a difference of size. A holder marked 68.2 x 68.2 x 115 mm closes on all of them, so nothing about the fit warns anybody which one the device was designed around. What follows is what each kind does that the millimeters do not say.

• Alkaline (1 designation here) drops in voltage steadily as it empties, so a device calibrated for a flat discharge will drift as it goes.
• Carbon zinc (2 designations here) carries a fraction of the capacity of an alkaline cell of the same size and leaks more readily when spent.

None of this is a recommendation for a particular device. The device decides: a lamp tolerates almost anything that fits, a meter reports a number that is wrong by whatever the voltage is wrong by, and a sealed compartment is the one case where a zinc-air cell cannot work at all however well it sits. Where the maker of the equipment names a chemistry, that naming outranks every figure on this page.

What stands next to this envelope in the data

The envelope above is not the only one near it. Cells that miss by a fraction of a millimeter sit in the same drawer and look identical in the hand, and the question they raise is the one this site answers: not whether a cell is the same, but what the difference does. These are the nearest envelopes to 68.2 x 68.2 x 115 mm in this data, closest first.

• 68.2 x 68.2 x 112 mm — fits but sits lower, first met here as 4LR25Y.
• 66.7 x 66.7 x 109.5 mm — is too narrow to hold contact, first met here as R25-4.
• 66.7 x 33.8 x 102.4 mm — is too narrow to hold contact, first met here as R25-2.
• 68.3 x 56.4 x 99.2 mm — is too wide to enter, first met here as 722.
• 76.2 x 58.7 x 105 mm — is too wide to enter, first met here as 30R6.
• 76.2 x 58.7 x 104.8 mm — is too wide to enter, first met here as HS14196.

None of the nearest would drop straight in on size alone. Every verdict in that list is about the compartment alone. A cell that drops in physically can still be the wrong cell: the voltage and the chemistry are separate questions, answered separately above and on the page of each designation. Nothing here says a substitution is safe for a particular device, and where the maker of the device names a cell, that naming outranks every millimeter on this page.

What is gone from this shell

1 designation of the 3 here is no longer listed by Energizer: 4R25X. The compartment is the same size for the rest, and that is the only thing the size settles.

Fit answers whether it enters the compartment; every cell here shares the envelope, so fit is already settled. Voltage answers whether the circuit will notice, and chemistry answers what the voltage column cannot say. A cell that fits is not always a safe substitute.

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.