Index / CR17345

CR17345

CR17345 — lithium, 3 V, 17 x 34.5 mm. Current, and nothing else in the data shares its size.

Also stamped 5018LC, 123 (EL123), ELN123, EVR123

One rung on a ladder of thicknesses

This is one rung of a ladder: 9 other cells share the differ mm diameter and 17 only in depth, running 21.5 to 99.8 mm against this one's 34.5. The nearest rung, 2LR50, is 33.4 mm — the same hole, less inside it.

What this cell can stand in for

7 designations Energizer no longer lists point at this cell as the closest thing it does list, and for 7 of them it is a different voltage class: the gap reaches 66.7%. For those it is not a substitution — read the voltage column before the fit column.

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.

Built for a load that alkaline cannot hold

Lithium is here for current, not for size. CR17345 delivers 3 V and holds it under a load that would drag an alkaline cell of the same envelope down within seconds. Energizer publishes an operating range down to -40 C (-40 F) for this cell, which is the reason it turns up in outdoor and automotive equipment.

1500 mAh in 7 cubic centimeters. Density is the whole argument for the chemistry, and it is why the compartment is small. Nothing else in the Energizer data this site reads shares this envelope, so a cell that fits the holder is almost certainly this one. 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: 123 (EL123), ELN123 and EVR123.

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 123 (EL123), ELN123 and EVR123.

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 CR17345 carries an operating range as well as a capacity, and it reaches -40 C (-40 F) at the cold end. 4 more published figures follow it, and none of them reaches a cross-reference table.

The part occupies 7 cubic centimeters and weighs 16.5 g. Capacity and voltage together put 4500 milliwatt-hours in that space. Energizer files it for Asia Pacific, Europe and Latin America.

Operating range

-40 C (-40 F) to 60 C (140 F). Below the lower figure the maker makes no claim at all, which is not the same as the cell stopping.

Cutoff voltage

2 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

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

Mass against volume

16.5 g filling 7 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: 4500 milliwatt-hours in 7 cubic centimeters is 643 mWh per cc, denser than 97% of every cell measured here. Density is ours: the maker publishes capacity and volume and never divides one by the other.

More energy per cubic centimeter than most

CR17345 packs more into its volume than most of what is measured here: 643 milliwatt-hours per cubic centimeter, above 97 percent of the corpus.

0 of those ones are still listed. Its 643 milliwatt-hours per cubic centimeter sit above 97 percent of everything here that publishes both a capacity and a volume. 3 of the 69 cylinders share its 3 V exactly.

• 7LR44 — the next step down by volume: 6.2 cubic centimeters against this cell's 7.
• 3-315 — the next step up: 7.4 cubic centimeters, 106% of this one.
• 2LR50 — 17.1 x 33.4 mm, 3 V, alkaline.
• 3LR50 — 16.8 x 49.9 mm, 4.5 V, alkaline.

The names on the package that are not designations

CR17345 answers to 3 markings outside the standard: CR123A, 123A and DL123A. A retail trade marking, not an iec designation, and no standards body stands behind any of them, which is why none is printed under Also stamped above.

• CR123A — a retail trade marking, not an IEC designation.
• 123A — a retail trade marking, not an IEC designation.
• DL123A — a retail trade marking, not an IEC designation.
• 5018LC — a manufacturer part number for CR17345, not a standard designation.
• 123 (EL123) — a manufacturer part number for CR17345, not a standard designation.
• ELN123 — a manufacturer part number for CR17345, 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 CR17345 are the ones that keep its diameter and change its depth. 9 cells share this diameter at depths from 21.5 to 99.8 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 16.5 g.

• 3MR9 — same diameter, 21.5 mm tall against this cell's 34.5: 13 mm shallower, which neither designation carries.
• 2LR50 — same diameter, 33.4 mm tall against this cell's 34.5: 1.1 mm shallower, which neither designation carries.
• 4LR52 — same diameter, 44.9 mm tall against this cell's 34.5: 10.4 mm deeper, which neither designation carries.
• MR50 — 16 mm across at 1.4 V against 17 mm here, 1 mm apart: loose in this holder.
• LR50 — 15.8 mm across at 1.5 V against 17 mm here, 1.2 mm apart: loose in this holder.

One figure the maker does not publish

One field is empty for CR17345: 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: 17 x 34.5 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 this data is this exact size, but the diameter is a well populated one: 9 cells run from 21.5 to 99.8 mm deep, and this cell is one point on that scale.

• 3MR9 — 16.8 x 21.5 mm, 4.5 V
• 2LR50 — 17.1 x 33.4 mm, 3 V
• 4LR52 — 17.1 x 44.9 mm, 6 V
• 3LR50 — 16.8 x 49.9 mm, 4.5 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.

The records behind this page

CR17345 is not one catalog entry. 3 records carry this designation, 3 of them with a technical data sheet, and each is numbered below with a direct link to the sheet the figures came from.

1. [1] Energizer catalog record 54, listed as 123 (EL123), active in the snapshot. Technical data sheet: 123.pdf.
2. [2] Energizer catalog record 2977, listed as ELN123, active in the snapshot. Technical data sheet: eln123-industrial-gl0920.pdf.
3. [3] Energizer catalog record 3739, listed as EVR123, active in the snapshot. Technical data sheet: EVR123EU0826.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.

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