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.
Every cell in this shell at one scale
| Cell | Envelope | Volts | Chemistry | Energizer |
|---|---|---|---|---|
| 4LR25X | 68.2 x 68.2 x 115 mm | 6 V | alkaline | Listed |
| 4R25 | 68.2 x 68.2 x 115 mm | 6 V | carbon zinc | Listed |
| 4R25X | 68.2 x 68.2 x 115 mm | 6 V | carbon zinc | Not listed |
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.
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.
| Still listed | Voltage against 4R25X | What the percentage does not say |
|---|---|---|
| 4LR25X | 6 V 0%same volts | Alkaline rather than carbon zinc, so it empties along a different curve |
| 4R25 | 6 V 0%same volts | Same chemistry, so the voltage column is the whole difference |
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.