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RAYOVAC
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Rayovac: understand the range before choosing
The Rayovac range on this page consists of two non-rechargeable silver-oxide button batteries supplied in tens: code 377 at a stated 1.55 V and code 392, whose title says 1.5 V while the live description says 1.55 V. Industry datasheets identify 377 with IEC SR66 and 392 with IEC SR41. Similar voltage does not make the two physical sizes interchangeable.
AutoMotoPart currently lists 2 Rayovac items. The largest Rayovac groups are 2 silver-oxide button-cell entries. Rayovac totals can change, so a category count is orientation rather than proof that a particular reference suits a vehicle, workplace or job. The exact Rayovac listing, its current technical information and the item in front of you must agree.
What the Rayovac page actually covers
| Product group in this range | Current entries | Selection focus |
|---|---|---|
| 377 and 392 silver-oxide batteries | 2 | Two distinct pack-of-ten silver-oxide references: match 377/SR66 or 392/SR41 by exact device specification, dimensions and polarity; neither is rechargeable. |
377 and 392 share nominal silver-oxide voltage but differ physically. The live catalogue does not establish vehicle fitment or prove either belongs in a particular key fob, watch or instrument. One pack contains ten identical cells; it is not a ten-cell assembled battery.
Build a reliable shortlist
Use the device handbook and the code on the installed cell. Record all characters before disposal because suffixes can distinguish drain characteristics or packaging. Measure the holder only as a secondary check, with power isolated and without bridging contacts.
| Check | Why it matters | Useful evidence |
|---|---|---|
| Reference | 377 corresponds to SR66; 392 corresponds to SR41 in industry data | Device manual, old-cell stamp and current pack |
| Dimensions | 377 is smaller than 392 in both diameter and height | Manufacturer datasheet and holder design |
| Voltage | Both are nominally about 1.55 V despite rounded title wording | Specified chemistry and device input requirement |
| Drain profile | Equivalent-looking button cells can be optimised differently | Exact suffix/equivalence approved by device maker |
| Environment | Temperature, moisture and seal condition affect service | Device operating limits and watch-sealing procedure |
| Safety | Loose button cells create ingestion and short-circuit hazards | Locked storage, intact packs and recycling controls |
Do not use online fitment text or unrelated numbers embedded in a listing as proof. If the old cell is unmarked, corroded or absent, identify the device model and obtain its official battery specification rather than trial-fitting cells.
377 and 392 are dimensions, not interchangeable labels
Silver-oxide cells use zinc/silver-oxide chemistry to provide a relatively stable nominal voltage for compact low-drain devices. Official industry datasheets for the standard sizes list 377/376 as IEC SR66 at nominal 1.55 V, around 6.8 mm diameter and 2.6 mm high. The 392 is IEC SR41 at nominal 1.55 V, around 7.9 mm diameter and 3.6 mm high. Typical capacity figures are test-dependent and must not be promised as device runtime.
The numbers 376 or 384 sometimes appear paired with 377 or 392 in industry literature, but equivalence can involve drain profile and manufacturer naming. Do not silently broaden this Rayovac range to every paired number. Use only an equivalence explicitly accepted by the device maker and verify the current Rayovac pack marking.
Confirm the holder, polarity and device seal
Photograph the old cell in position before removal. Note which broad face is positive, the spring/contact path and any insulating ring. Use a non-conductive tool recommended for the product; metal tweezers can short the faces. Do not bend a delicate retaining clip or press on a display mechanism while levering a cell out.
For watches and sealed instruments, battery replacement may disturb a gasket or case seal. A new cell alone does not restore water resistance. Inspect and renew seals as specified, lubricate only with the approved material, close to the correct procedure and pressure-test where the maker requires. Stop if leakage has corroded contacts or the case.
Install without contamination or improvised stacking
Skin oils and dirt can increase contact resistance on very small cells. Handle by the edge with clean dry gloves or non-metallic tweezers, and wipe only as the battery/device instructions permit. Confirm polarity twice, seat the cell flat and close the retainer without force. Never stack two lower cells to imitate a taller one: series voltage and mechanical pressure can damage the device.
Do not mix an old cell with a new one in multi-cell equipment. Replace the set with identical fresh cells from the same pack when the device specifies that approach. If a new correct cell fails, inspect contact tension, corrosion and device electronics. Repeated insertion of wrong sizes can score insulation and create shorts.
Button-cell ingestion requires immediate action
A swallowed button battery can lodge and cause serious tissue injury rapidly. Storage must prevent access, not merely rely on telling a child not to touch it. Keep packs secured, count cells issued, retrieve dropped cells immediately and place spent batteries in a locked container. Pets face comparable hazards.
After suspected swallowing or insertion into an ear or nose, seek immediate emergency/poisons guidance and identify the cell if possible. Do not induce vomiting or offer food/drink unless emergency professionals direct it. Even a depleted cell remains hazardous. Inspect packaging and battery compartments so a child cannot open them without the intended tool.
Storage, leakage and responsible disposal
Keep cells in original packaging in a cool dry place, separated by code and away from conductive metal. Never store them loose in a drawer, pocket or vehicle cupholder. Avoid temperature extremes and direct sunlight. Do not freeze, burn, crush, recharge or dismantle. Do not solder directly to the can unless a manufacturer supplies a purpose-made tagged version and process.
Treat swelling, odour, corrosion or leakage as damage. Ventilate, avoid skin/eye contact and follow the current battery safety sheet. Remove a leaking cell only if safe, protect the device from residue and wash exposed skin as directed. Insulate terminals where the recycling scheme requires and take all spent cells to an approved battery collection point rather than general waste.
From identification to a checked result
| Stage | Good practice for this range | Mistake to avoid |
|---|---|---|
| Identify | Read device manual, old cell and polarity diagram | Selecting by voltage or visual size alone |
| Compare | Match 377/SR66 or 392/SR41 dimensions and approved suffix | Assuming paired industry codes always suit the device |
| Prepare | Isolate device, photograph orientation and inspect holder/seal | Shorting contacts with loose metal tools |
| Install/test | Use clean handling, correct polarity and normal closure | Forcing, stacking or mixing old and new cells |
| Store/recycle | Secure every spare/spent cell and use a battery scheme | Leaving button cells accessible or putting them in general waste |
Record device model, removed-cell code, installed reference, date and any seal/pressure test. For workplace stock, keep packs separated and reconcile issued and returned button cells so none remain loose.
Reading real Rayovac references
The Rayovac names below are examples from the current range and show why the complete description matters. They are not universal Rayovac recommendations and should not be treated as a fitment list. Within Rayovac, a shared family word can conceal a different dimension, connector, material, pack format, operating condition or installation side.
| Example listing | What to verify beyond the name |
|---|---|
| Coin Cell Battery 377 - Silver Oxide 1.55V - Strip of 10 | 377 pack of 10: silver oxide, nominal 1.55V, industry IEC SR66 size; verify current Rayovac stamp and device approval |
| Watch Battery 392 - Silver Oxide 1.5V - Box of 10 | 392 pack of 10: silver oxide, catalogue title 1.5V/description 1.55V, industry IEC SR41 size; resolve against pack and device manual |
Ignore unrelated vehicle/component data accidentally present in product descriptions. These are domestic button cells without evidenced vehicle fitment; exact device documentation controls selection.
Common errors around Rayovac products
- Treating 377 and 392 as interchangeable because both are around 1.55V.
- Using unrelated vehicle numbers in the catalogue text as fitment evidence.
- Forcing a larger cell or stacking smaller cells in a holder.
- Reversing polarity or bridging the faces with metal tweezers.
- Mixing codes, chemistries, ages or charge states.
- Assuming a watch remains water-resistant after opening.
- Attempting to recharge, solder, heat, crush or dismantle a primary cell.
- Leaving spare or spent button batteries accessible to children or animals.
Rayovac questions and answers
Q: Which Rayovac cells are listed?
A: 377 and 392 silver-oxide button cells, each in a pack of ten.
Q: Are 377 and 392 interchangeable?
A: No. Their industry-standard diameters and heights differ.
Q: What IEC code matches 377?
A: Industry data identifies it as SR66; confirm the current pack and device manual.
Q: What IEC code matches 392?
A: Industry data identifies it as SR41; confirm the exact device specification.
Q: Why does 392 say 1.5V and 1.55V?
A: The title is rounded while the description gives nominal 1.55V; the complete cell code matters.
Q: Can either cell be recharged?
A: No. They are non-rechargeable primary silver-oxide cells.
Q: Can I use one in a vehicle key?
A: Only if the key maker specifies that exact code; no vehicle fitment is evidenced here.
Q: Can I stack cells to make the height?
A: No. Stacking changes voltage and contact pressure and may damage the device.
Q: How should polarity be checked?
A: Use the device diagram, photograph the old cell and match the marked positive/negative faces.
Q: Does changing a watch battery preserve waterproofing?
A: Not automatically; gasket service and pressure testing may be required.
Q: What if a button battery is swallowed?
A: Seek immediate emergency/poisons advice and do not wait for symptoms.
Q: How are spent cells discarded?
A: Secure them and use an approved battery-recycling collection route.
