TIANQIUFossil Watch Battery
Fossil Watch Battery Replacement
Factory-direct 377 watch cells — bulk pricing, custom label on the cell and on the packaging.
What battery does a Fossil watch take?
Most Fossil analog watches run on a 377 / SR626SW silver-oxide cell. Read the code off your old cell to confirm — if the print has worn off, measure it.
1.55VNominal voltage
6.8 × 2.6 mmDiameter × height
24 mAhCapacity
377 = SR626SW = SR626 = 376Equivalent numbers
Not the same cell: AG4 / LR626 is the 1.5V alkaline cell in the same 6.8 × 2.6 mm size — it drops in, but a watch needs silver oxide to hold its voltage flat as it discharges.
Fossil analog watches commonly run on a 377 / SR626SW silver-oxide cell — but read the marking on your old cell to confirm, and if you are unsure use Fossil's own style-number lookup below. We manufacture the 377 cell ourselves and supply it factory-direct, with bulk pricing and OEM custom label for watch and retail programmes.
Battery Type
The Fossil Watch Battery: 377
Dimensional drawing — cell photo on request
377 Specifications
| Model | 377 |
|---|---|
| Chemistry | Silver Oxide |
| Voltage | 1.55V |
| Diameter | 6.8mm |
| Thickness | 2.6mm |
| Capacity | 24mAh |
| Equivalent to | 377 = SR626SW = SR626 = 376 |
Equivalent to 377 = SR626SW = SR626 = 376. See the full cross-reference table. A steady 1.55V silver-oxide cell is the correct choice for a watch movement.
Capacity: 24mAh · Thickness: 2.6mm.
Cross reference
Watch battery chart — which cell does each watch brand take?
Each row is a code a watch brand prints on its cells, mapped to the standard silver-oxide cell of the same size in a manufacturer-published chart. Read the code off your old cell, match it here, then measure the cell you removed — brand numbering does not always line up with the standard size number.
| Brand | Brand's own code | Standard cell | Voltage | Size | Documented in |
|---|---|---|---|---|---|
| Fossil | uses the standard number | 377 / SR626SW | 1.55V | 6.8 × 2.6 mm | Maxell · Duracell (376/377 row) |
| Seiko | SB-AW | 377 / SR626SW | 1.55V | 6.8 × 2.6 mm | Maxell (SEIKO column) · Duracell (SB-AW) — cross-confirmed |
| Citizen | 280-39 | 377 / SR626SW | 1.55V | 6.8 × 2.6 mm | Maxell (CITIZEN column) · Duracell (280-39) — cross-confirmed |
| Timex | BA | 377 / SR626SW | 1.55V | 6.8 × 2.6 mm | Maxell (TIMEX column) — single source, treat as unconfirmed |
| Bulova | 606 | 377 / SR626SW | 1.55V | 6.8 × 2.6 mm | Maxell (BULOVA column) — single source, treat as unconfirmed |
| Bulova | 619 | 376 / SR626W | 1.55V | 6.8 × 2.6 mm | Maxell · also listed by Energizer's Bulova finder |
| Apple | not a watch cell | CR2032 | 3.0V | 20 × 3.2 mm | Apple product documentation (AirTag; CMOS in older Macs) · our CR2032 data sheet |
Read this before you buy: A brand code identifies the cell size, not the watch model — two watches from one brand can need different cells, and one Bulova model is documented as taking a 3V CR2016 rather than a silver-oxide cell. Where the brand publishes an official model-to-battery lookup, use that first: Fossil, Bulova and Apple all do, and each is linked from its page here.
Sources: Maxell Micro Battery Cross Reference and Replacement Guide (SEIKO, CITIZEN, TIMEX and BULOVA columns) · Duracell 2024 Battery Specifications · Energizer's Bulova watch battery finder · our own cell data for the 377, 376 and CR2032. Rows marked single source appear in one manufacturer's chart only.
Brand guidance
What does Fossil say about replacing the battery?
Before the practical steps, it is worth knowing what the watchmaker itself advises. These points are quoted from Fossil's own support documentation, so you can weigh them against doing the job yourself.
- Fossil states its watch batteries are not intended to be replaced by consumers, to help prevent accidental ingestion and to keep the case-back seal intact.
- Fossil quotes US$25 for a battery replacement carried out in one of its stores; mailed-in repairs are priced separately.
- Fossil expects the battery in a traditional Fossil watch to last about 2 years from the date it is replaced.
- Fossil publishes a movement and battery type lookup: entering the watch style number returns the battery type for that model.
Source: Fossil Group support — “Battery Information” (support.fossilgroup.com). The steps below are what a watch technician does; if you would rather not open the case, the brand's own service route is the safer option and keeps any warranty intact.
Choosing a route
What to do about a Fossil watch battery
Fossil's own documentation is clear on who should do the work, and it is not the same answer for everyone. Here is the position from Fossil's support pages next to what we can supply — so you can pick the route that suits you.
| Your situation | What Fossil's own documentation says | What we can supply |
|---|---|---|
| The watch is losing time or has stopped | Fossil expects the battery in a traditional Fossil watch to last about 2 years from the date it is replaced. | We manufacture the 377 / SR626SW silver-oxide cell the watch needs, and supply it factory-direct in bulk or with your brand on it. |
| You want Fossil to do it | A battery replacement carried out in a Fossil store is quoted at US$25; mailed-in repairs are priced separately. | Nothing to supply — go to Fossil. This is the route that keeps any warranty and the case-back seal intact. |
| You are replacing it yourself | Fossil states its watch batteries are not intended to be replaced by consumers, to help prevent accidental ingestion and to keep the case-back seal intact. | The cell itself plus the verified equivalents below, so you order the right one first time. The steps are further down this page. |
| You do not know which cell your model takes | Fossil publishes a lookup: enter the watch style number and it returns the movement and setting instructions for that model. | We cannot reproduce that lookup — it is per style number and served by Fossil. Use their tool (linked above), or read the marking off your old cell. |
Why there is no model-by-model battery table on this page: Fossil resolves the cell per style number through its own lookup rather than publishing a list, so any such table we printed would be a guess. The table above stays with what Fossil documents and what we can verify.
Cross Reference
377 / SR626SW cross-reference
If your Fossil takes a 377, these are the other numbers that point at the same cell. Both families share the 6.8 × 2.6 mm footprint, so read the chemistry before substituting.
Same chemistry — 1.55V silver oxide, direct replacement
| Number on the cell | Published by |
|---|---|
| 376 / SR626W | Maxell · Duracell (376/377 row) |
| SR626SW | IEC type · Maxell · Duracell |
| D377 | Duracell (own code) · Maxell |
| V377 / V376 | Varta (own code) · Maxell |
| SB-AW / SB-BW | Seiko (own code) · Maxell |
| 280-39 / 280-72 | Citizen (own code) · Maxell |
| 606 / 619 | Bulova (own code) · Maxell |
| SR66 | Vinnic / GP (own code) · Maxell |
Same 6.8 × 2.6 mm footprint, different chemistry — 1.5V alkaline
| Number on the cell | Published by |
|---|---|
| AG4 / LR626 | retail trade name for the 1.5V alkaline cell of this size — not listed in the Duracell, Energizer, Maxell or Renata charts consulted — single source, treat as unconfirmed |
377 is the high-drain silver-oxide cell (SR626SW); 376 is the low-drain version (SR626W) of the same size. Both are 1.55V silver oxide and both will fit, but the drain design differs, so fit the type the device specifies. AG4 / LR626 is the 1.5V alkaline cell of the same size — it drops in physically, but a watch needs the silver-oxide chemistry to hold its voltage flat as it discharges.
Sources: Maxell Micro Battery Cross Reference and Replacement Guide · Duracell 2024 Battery Specifications · Energizer · Varta · Renata / Vinnic-GP charts. Numbers marked "single source" appear in one manufacturer's documentation only.
How-To
How to Replace a Fossil Watch Battery
- Open the watch case back with a watch-back tool or flat screwdriver
- Note the battery size and which side faces up
- Remove the old 377 cell with non-metallic tweezers
- Insert a fresh 377 battery with the correct polarity
- Re-seal the case and set the time
Match the exact size and voltage. A wrong-thickness cell can jam the case back or power the watch incorrectly.
Watch Batteries
Which other watch battery models are there?
Size Guide
How do I find the right watch battery size?
A watch cell is identified by diameter and thickness together — the IEC type number encodes both. Read the marking on your old cell and match it below; if the marking has worn away, measure the cell and pick the row that matches. These are the silver-oxide watch cells we manufacture.
| Model | Voltage | Diameter | Thickness | Capacity | Also marked |
|---|---|---|---|---|---|
| SR626 | 1.55V | 6.8mm | 2.6mm | 27mAh | SR626SW · 377 · 376 |
| 377 | 1.55V | 6.8mm | 2.6mm | 24mAh | SR626SW · SR626 · 376 |
| 364 | 1.55V | 6.8mm | 2.1mm | 18mAh | SR621SW · AG1 |
| 371 | 1.55V | 9.5mm | 2.1mm | 38mAh | SR920SW · 370 |
| SR44 | 1.55V | 11.6mm | 5.4mm | 175mAh | SR44W · 357 · 303 |
Fit is decided by size and voltage, not by brand — that is why the same cell carries several trade numbers (377 = SR626SW = AG4 = SG4). Match on diameter and thickness and the cell will seat correctly.
Guide
How to Replace a Watch Battery (Tools, Sizes and Steps)A watch battery change needs the right cell, a case-back tool and a clean bench. Step-by-step, plus the watch cell sizes we make.
FAQ
What do buyers ask about Fossil watch batteries?
What battery does a Fossil watch use?
Most Fossil watches take a 377 battery (1.55V, 6.8mm). Check the model number on your old cell to confirm.
How do I replace a Fossil watch battery?
Pry the case back open with a watch-back tool, note the battery polarity, remove the old cell with non-metallic tweezers, insert the new battery (correct side up) and re-seal the case.
Is the 377 battery rechargeable?
No — the standard 377 is a primary (non-rechargeable) Silver Oxide cell. Replace it rather than recharge.
How do I check which watch battery size I need?
Read the marking on the old cell first — it is printed on the face or the rim (for a Fossil that is usually 377, also written SR626SW). If the print has worn off, measure the old cell: diameter and thickness together identify the model. A 377 is 6.8mm across and 2.6mm thick.
What do the numbers on a watch battery mean?
The IEC type number encodes the size, not the brand. In SR626SW the code gives a 6.8mm diameter and 2.6mm thickness at 1.55V. Trade numbers point at the same cell — 377 = SR626SW = SR626 = 376 — so any of those markings is a direct replacement for the other.
Does it matter which watch battery brand I buy?
Fit is set by the model number, not the brand: any cell matching the size and voltage fits the holder. What does vary is the capacity and the consistency of the discharge curve, which is why we publish 24mAh for the cell we supply and can send the discharge data with a quote.
How do I buy 377 watch batteries in bulk?
Factory-direct 377 cells with OEM custom label. Get a quote today.