Index / Shell 14.5 x 50.5 mm / R6

R6 battery equivalent: what to use instead

R6 carbon zinc battery — 1.5 V, 14.5 x 50.5 mm, known as an AA battery. Any brand's R6 is this same cell. LR6, FR14505 and FR6 take the same slot at the same 1.5 V; HR6 drops straight in, and runs 1.2 V — -20.0%, which reads low, and it is rechargeable, never a drop-in. Battery equivalent chart for every other code.

What fits the compartment, and what does not

R6 battery equivalent chart: candidates for an R6 battery replacement, one row each. 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 15F, 1015, 15D, 1215, HS15

Names filed here that belong to another chemistry

The maker files 2 names under this designation with a different chemistry recorded against 2 ones. Same code, different insides, and the package is the only place that says which.

• 15A — filed under this designation by the maker but recorded as alkaline, which is a different cell in the same shape.
• A91 — filed under this designation by the maker but recorded as alkaline, which is a different cell in the same shape.
• 15F — a manufacturer part number for R6, not a standard designation.
• 1015 — a manufacturer part number for R6, not a standard designation; 1015 batteries are this same cell, so a 1015 battery equivalent is whatever replaces R6.
• 15D — a manufacturer part number for R6, not a standard designation.
• The maker's own catalog carries 4 product lines under it.

The cell that differs only in depth

The code says the size, so the cells that get confused with R6 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.

It stands 3 of 3 in this envelope by stored energy. On a scale the difference shows before it shows on a caliper: this one weighs 15 g.

• 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.
• FR14505 — the same 14.5 x 50.5 mm in lithium at 1.5 V. Identical on a caliper, different in the circuit.
• FR6 — the same 14.5 x 50.5 mm in lithium at 1.5 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.

The Energizer data sheets behind this page do not agree on capacity (700–1100 mAh over 2 sheets), so each figure is printed as the range the sheets give, not as one of them. Where one number is needed to rank or compare, the page uses the median of the sheets, 900 mAh.

Same size, and not the same voltage

The AA compartment takes cells of more than one voltage. This one is 1.5 V; HR6 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

2 designations Energizer no longer lists point at this cell as the closest thing it does list, and the voltage is the same. If a device was built for one of them, this is a straight substitution.

Each row names a cell no longer made, with its own voltage and chemistry. Fit of this cell and Voltage of this cell describe this cell put in its place: whether it enters that compartment, and how far its voltage sits from the voltage the device was built for. The discontinued cell’s own page prints the same figure for the same swap.

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 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.
• Lithium runs at 1.5 V, the same nominal the alkaline and silver classes carry. Of the 24 lithium cells here whose envelope the maker publishes, 3 share that envelope with an alkaline or silver cell.
• 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.

The household slot this size sits in

R6 is an AA, which is a shape rather than a specification: 11 designations share the same slot in the Energizer data this site reads under different chemistries. This one is carbon zinc at 700–1100 mAh. Across the AA the published capacity runs from 2850 mAh (3-315) to 1300–2650 mAh (HR6). The compartment does not change; the run time changes by up to 2.2x.

The other chemistries in this slot are alkaline, lithium, mercuric oxide and nickel-metal hydride, and only the label says which one is in your hand. 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. The maker still lists it, under 4 product lines: 1015, 1215, A91 and HS15.

• By stored energy it stands anywhere from 2 to 3 of 3 in its envelope, at 1050–1650 milliwatt-hours, depending on which data sheet is read.
• 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.

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 1015, 1215, A91 and HS15.

Energizer files 15A and A91 under this designation as well, but its records give those an alkaline chemistry rather than carbon zinc. They are a different cell, not another marking for this one.

The maker’s records filed under this designation do not all publish the same outside size. The table prints the figure most of them carry; the rest publish a diameter of 14.3 mm under HS15 and a height of 50.1 mm under HS15. Where the records part company the package in your hand decides, and this page cannot tell you which record it came from.

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 R6 carries an operating range as well as a capacity, and it reaches -18 C (-0 F) at the cold end. 3 more published figures follow it, and none of them reaches a cross-reference table.

The part occupies 8 cubic centimeters and weighs 15 g. Capacity and voltage together put 1050–1650 milliwatt-hours in that space. Energizer files it for Asia Pacific, Europe and Latin America.

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.

Cutoff voltage

0.8 V. The published capacity is counted down to this voltage; a device that quits higher up sees less than the whole figure.

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?

Its place depends on which data sheet you trust. 1050–1650 milliwatt-hours by the sheets behind this page puts it anywhere from 2 to 3 of the 3 cells measured in this shell, because the sheets of this cell or of its neighbours print a range rather than one capacity.

Less energy per cubic centimeter than most

R6 carries less in its volume than most: 131–206 milliwatt-hours per cubic centimeter, below 80 to 91 percent of everything here that publishes both figures.

4 of those ones are still listed. Its 131–206 milliwatt-hours per cubic centimeter sit above 9 to 20 percent of everything here that publishes both a capacity and a volume. 36 of the 66 cylinders share its 1.5 V exactly.

• 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.
• FR14505 — 14.5 x 50.5 mm, 1.5 V, lithium.
• FR6 — 14.5 x 50.5 mm, 1.5 V, lithium.

One figure the maker does not publish

One field is empty for R6: 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 4 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: 14.5 x 50.5 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 here is the figure for one swap: the voltage of the cell that goes in, measured against the cell the device was built for, and the figure belongs to the cell whose voltage is printed beside it. In the table of cells that fit in place of this one, and on the scale, that is each candidate against this cell: a cell that runs lower carries a minus, one that runs higher carries a plus, and a cell at the same nominal voltage carries zero. In the table of cells no longer made, it is this cell against each of them, because the swap goes into a device built for the old cell, and that cell’s own page prints the same figure for the same swap. Where cells still listed can each stand in for the other, those are different swaps: each page measures against its own cell, the sign is the other one, and the size can differ slightly, because one gap is a larger share of the lower voltage; 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: 4 cells sit at exactly this size in alkaline, lithium and nickel-metal hydride. Same hole, different insides, different discharge curve.

• FR14505 — 14.5 x 50.5 mm, 1.5 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.

Records that disagree behind this page

R6 is assembled from 4 catalog records, and they do not agree with each other on every field. Both sides are numbered below so the disagreement can be read rather than taken on trust.

1. [1] Energizer catalog record 48, listed as 1215, active in the snapshot. Technical data sheet: 1215.pdf.
2. [2] Energizer catalog record 326, listed as 1015, obsolete in the snapshot. Technical data sheet: 1015.pdf.
3. [3] Energizer catalog record 903, listed as HS15, obsolete in the snapshot. Technical data sheet: hs15.pdf.
4. [4] Energizer catalog record 1125, listed as A91, active in the snapshot. Technical data sheet: A91EU0126.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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