Index / Shell 14.5 x 50.5 mm / FR14505

FR14505

FR14505 — lithium, 1.5 V, 14.5 x 50.5 mm, known as an AA cell. Current. LR6 and FR6 take the same slot at the same 1.5 V; R6 drops straight in, and runs the same 1.5 V, and it is carbon zinc, which holds far less; HR6 drops straight in, and runs 1.2 V — -20.0%, which reads low, and it is rechargeable, never a drop-in.

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.

4 cells drop in and they are not equivalent: of those, HR6 sits furthest at -20.0% of this cell’s 1.5 V, low enough that a calibrated instrument reads below true.

Also stamped 15-LF, LN91

Same size, and not the same voltage

The AA compartment takes cells of more than one voltage. This one is 1.5 V; 1.2H2 in the same size runs 1.2 V, -20.0% of this cell — low enough that a calibrated instrument reads below 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

3 designations Energizer no longer lists point at this cell as the closest thing it does list, and the voltage is not the same: the gap reaches 20.0%. The device will run, and an instrument calibrated for the old cell will read off.

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 3 other kinds are in play here beside the lithium this cell uses.

• Lithium runs at 1.5 V, the same nominal the alkaline and silver classes carry. Of the 26 lithium cells here whose envelope the maker publishes, 3 share that envelope with an alkaline or silver cell.
• Alkaline drops in voltage steadily as it empties, so a device calibrated for a flat discharge will drift as it goes.
• Carbon zinc carries a fraction of the capacity of an alkaline cell of the same size and leaks more readily when spent.
• Nickel-metal hydride is rechargeable and sits at 1.2 V, below the nominal of the primary cell whose slot it takes. It is never a drop-in for a primary cell no matter how well it fits, and a device that cuts off early will read it as flat.

Built for a load that alkaline cannot hold

Lithium is here for current, not for size. FR14505 delivers 1.5 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.

1.2H2, FR6 and HR6 shares this envelope in the Energizer data this site reads at a different voltage, so the compartment alone will not tell you which one the equipment expects. 4 cells measure close enough to compare against it in the Energizer data this site reads, and 4 of them are still listed. The nearest is LR6: it drops straight in and runs 1.5 V, same volts.

• 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 1 product line: LN91.

Drawn to scale

Every published figure

Capacity is missing here, and with it every figure derived from capacity: 10 figures are published, 4 fields are not.

What the maker says about cold

The sheet for FR14505 carries an operating range as well as a capacity, and it reaches -40 C (-40 F) at the cold end. 2 more published figures follow it, and none of them reaches a cross-reference table.

The part occupies 8 cubic centimeters and weighs 15 g. 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.

Mass against volume

15 g filling 8 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: 14.5 x 50.5 mm, against a shell that holds 6 designations.

A width the catalog keeps returning to

14.5 mm is a width this catalog keeps coming back to: 9 cylinders sit within half a millimeter of it, FR14505 included.

• 3-315I — the next step down by volume: 7.8 cubic centimeters against this cell's 8.
• LR6 — the next step up: 8.1 cubic centimeters, 101% of this one.
• 1.2H2 — 14.5 x 50.5 mm, 1.2 V, nickel-metal hydride.
• FR6 — 14.5 x 50.5 mm, 1.5 V, lithium.
• 4 of those ones are still listed. 36 of the 69 cylinders share its 1.5 V exactly.

The maker's own part numbers

FR14505 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.

• 15-LF — a manufacturer part number for FR14505, not a standard designation.
• LN91 — a manufacturer part number for FR14505, not a standard designation.

The cell that differs only in depth

The code says the size, so the cells that get confused with FR14505 are the ones that keep its diameter and change its depth. 2 cells share this diameter at depths from 47.6 to 48.4 mm, and every one of them enters the same opening.

• 3-315INNC — same diameter, 47.6 mm tall against this cell's 50.5: 2.9 mm shallower, which neither designation carries.
• 3-315I — same diameter, 48.4 mm tall against this cell's 50.5: 2.1 mm shallower, which neither designation carries.
• 1.2H2 — the same 14.5 x 50.5 mm in nickel-metal hydride at 1.2 V. Identical on a caliper, different in the circuit.
• HR6 — the same 14.5 x 50.5 mm in nickel-metal hydride at 1.2 V. Identical on a caliper, different in the circuit.
• 3-315 — 14 mm across at 1.5 V against 14.5 mm here, 0.5 mm apart: loose in this holder.
• On a scale the difference shows before it shows on a caliper: this one weighs 15 g.

What this page cannot tell you

3 of the 7 fields this site reads are empty for FR14505: 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: 14.5 x 50.5 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: 5 cells sit at exactly this size in alkaline, carbon zinc, lithium and nickel-metal hydride. Same hole, different insides, different discharge curve.

• 1.2H2 — 14.5 x 50.5 mm, 1.2 V
• FR6 — 14.5 x 50.5 mm, 1.5 V
• HR6 — 14.5 x 50.5 mm, 1.2 V
• LR6 — 14.5 x 50.5 mm, 1.5 V
• 3-315INNC — 14.3 x 47.6 mm, 1.5 V
• 3-315I — 14.3 x 48.4 mm, 1.5 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 record behind this page

Every figure on this page comes from one catalog record, number 2981, and it is linked below. The sheet is the document the dimensions, voltage and capacity were read out of.

1. [1] Energizer catalog record 2981, listed as LN91, active in the snapshot. Technical data sheet: LN91GL0726.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/fr14505/. It loads nothing from anywhere else. Paste this:

<iframe src="https://batterycross.com/embed/fr14505/" width="100%" height="520" loading="lazy" title="FR14505 replacements"></iframe>