5 Best Battery For Omega Seamaster in 2026

Like finding the right key for a vintage door, picking the right cell for your Seamaster can make all the difference—one wrong fit and the hands stop at a tide line. You’ll want batteries that match the exact SR code, voltage, and dimensions, and that won’t compromise water resistance. I’ll outline five top options and the key factors to check so you can choose confidently.

Our Top Battery Picks for Omega Seamaster

Cotchear AG6 Button Cell Batteries 1.55V (10-Pack) Cotchear 10 Pcs AG6 Button Cell Battery 1.55V Coin Alkaline Best Value Packchemistry/type: Alkaline/Ag-type button cell (labeled AG6; 1.55 V)nominal voltage: 1.55 Vintended use / compatibility: Watches, calculators, toys, cameras, clocks, remotes, etc.VIEW LATEST PRICERead Our Analysis
Maxell SR626SW (377) Silver Oxide Button Cell (2-Pack)Reliability Championchemistry/type: Silver‑oxide button cell (SR626SW / 377; 1.55 V)nominal voltage: 1.55 Vintended use / compatibility: Quartz watches, medical devices, keyless remotes, small electronicsVIEW LATEST PRICERead Our Analysis
379 SR521SW V379 Watch Battery 1.5V Button Cell (20-Pack)Bulk Supply Pickchemistry/type: Silver‑oxide button cell (SR521SW / V379; 1.5 V)nominal voltage: 1.5 Vintended use / compatibility: Watches (watch battery replacements; many equivalent watch part numbers)VIEW LATEST PRICERead Our Analysis
Universal Adjustable Watch Case Holder Repair ToolRepair Essentialchemistry/type: Tool (not a battery) — mechanical watch case holder (steel/polymer)nominal voltage: N/A (tool, not electrical)intended use / compatibility: Watch repair and case opening/servicing (holds watch during repair)VIEW LATEST PRICERead Our Analysis
CTL920 Rechargeable Solar Watch Battery Replacement for CasioEco-Friendly Choicechemistry/type: Rechargeable silver‑oxide/solar watch cell replacement (CTL920F; photorechargeable)nominal voltage: Rechargeable watch cell (voltage not listed explicitly in summary; designed for CTL920/CTL920F Casio compatibility)intended use / compatibility: Replacement rechargeable battery for Casio watches requiring CTL920/CTL920FVIEW LATEST PRICERead Our Analysis

More Details on Our Top Picks

  1. Cotchear AG6 Button Cell Batteries 1.55V (10-Pack)

    Cotchear 10 Pcs AG6 Button Cell Battery 1.55V Coin Alkaline

    Best Value Pack

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    Should you need an affordable, multipack replacement for older Seamaster models that accept SR920-type cells, the Cotchear AG6 10-pack gives you consistent 1.55 V power and the convenience of ten individually removable batteries—ideal should you work on multiple watches or want spares on hand. You’ll get high energy density and long life expectancy from each 0.39-inch button cell, packaged on a tear-off card so you remove one at a time. Cotchear tests to SGS standards and enforces strict quality control. Store them cool and dry, never recharge or incinerate, and consult manufacturer warranty details in case issues arise.

    • chemistry/type:Alkaline/Ag-type button cell (labeled AG6; 1.55 V)
    • nominal voltage:1.55 V
    • intended use / compatibility:Watches, calculators, toys, cameras, clocks, remotes, etc.
    • packaging / pack quantity:10‑pack on retail tear‑off card (individual removable)
    • manufacturer / brand:Cotchear
    • suitability for watches:Compatible with watches (listed among intended uses)
    • Additional Feature:Passed SGS testing
    • Additional Feature:Retail tear-off card
    • Additional Feature:High energy density

  2. Maxell SR626SW (377) Silver Oxide Button Cell (2-Pack)

    Reliability Champion

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    Should you want a reliable, low-drain replacement for an Omega Seamaster that prioritizes accuracy and leak resistance, the Maxell SR626SW (377) is a solid pick. You get two 1.55 V silver oxide button cells with high energy density and stable discharge, so your quartz movement keeps precise time. Maxell’s zero-mercury formula and leakage-resistant design reduce corrosion risk, and the blister pack with original hologram guarantees authenticity. These lightweight cells also suit medical devices and keyless remotes, but they shine in watches. In case you need a trusted, compact power source backed by decades of Maxell know-how, pick these.

    • chemistry/type:Silver‑oxide button cell (SR626SW / 377; 1.55 V)
    • nominal voltage:1.55 V
    • intended use / compatibility:Quartz watches, medical devices, keyless remotes, small electronics
    • packaging / pack quantity:2‑pack blister pack (original hologram packaging)
    • manufacturer / brand:Maxell
    • suitability for watches:Specifically designed for quartz watches (watch use highlighted)
    • Additional Feature:Zero mercury design
    • Additional Feature:Original hologram packaging
    • Additional Feature:Leakage-resistant design

  3. 379 SR521SW V379 Watch Battery 1.5V Button Cell (20-Pack)

    Bulk Supply Pick

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    Should you want a reliable, low-profile replacement for thin quartz Omegas like some Seamaster quartz variants, the SR521SW (V379) 1.5V button cell is a smart pick—its compact Ø5.8 × 2.15 mm size and consistent 15 mAh output fit small movements without bulk. You get a 20-pack of factory-fresh cells, so you can service multiple watches or keep spares. It’s cross-compatible with LR521, AG0, 379 and many OEM numbers (Citizen, Bulova, Timex), simplifying sourcing. Expect dependable, steady voltage for timekeeping in low-drain quartz calibers. Use proper polarity and watch-handling care whenever replacing.

    • chemistry/type:Silver‑oxide button cell (SR521SW / V379; 1.5 V)
    • nominal voltage:1.5 V
    • intended use / compatibility:Watches (watch battery replacements; many equivalent watch part numbers)
    • packaging / pack quantity:20‑pack (2 cards, 20 pcs)
    • manufacturer / brand:(unnamed brand listed as factory fresh; common OEM/manufacturer equivalents)
    • suitability for watches:Specifically a watch battery (SR521SW / V379 watch battery)
    • Additional Feature:15 mAh capacity
    • Additional Feature:Two blister cards (20 pcs)
    • Additional Feature:Factory fresh/new

  4. Universal Adjustable Watch Case Holder Repair Tool

    Repair Essential

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    Should you do a lot of DIY watch repairs or regularly swap batteries on an Omega Seamaster, a universal adjustable watch case holder is a must-have: its sturdy steel frame and removable pins keep cases locked in place so you can work precisely without slipping. You’ll secure watches of various sizes using adjustable pin slots and four red plastic pins, making case-back opening and battery swaps straightforward. Threaded locking and adjustment screws let you set and maintain position quickly. Built with reinforced polymer parts, it resists deformation and rust for long-lasting use. Compact (3.9 x 2.4 x 1.6) and lightweight (0.35), it streamlines repairs.

    • chemistry/type:Tool (not a battery) — mechanical watch case holder (steel/polymer)
    • nominal voltage:N/A (tool, not electrical)
    • intended use / compatibility:Watch repair and case opening/servicing (holds watch during repair)
    • packaging / pack quantity:Single tool (includes four removable pins and screws)
    • manufacturer / brand:(generic/unbranded tool; manufacturer not specified)
    • suitability for watches:Designed for watch repair/holding (tool for watches)
    • Additional Feature:Four removable red pins
    • Additional Feature:Threaded locking screws
    • Additional Feature:Rust-resistant steel frame

  5. CTL920 Rechargeable Solar Watch Battery Replacement for Casio

    Eco-Friendly Choice

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    Should you own a Casio watch that needs a CTL920/CTL920F cell and want a reliable, solar-rechargeable replacement, this CTL920 Rechargeable Battery Replacement is a solid choice—it’s Grade A+ and certified to UL, CE, and RoHS standards. You’ll get one CTL920F cell produced from Zhongshan Juyu Yunxing Technology, made under strict quality control. Install it, then expose the dial to sunlight or a lamp; a full charge typically takes 3–5 hours. The package lists dimensions 5 x 2 x 1 inches and weight 1.6 ounces. ASIN B0F25TF4SS; initially available March 22, 2025.

    • chemistry/type:Rechargeable silver‑oxide/solar watch cell replacement (CTL920F; photorechargeable)
    • nominal voltage:Rechargeable watch cell (voltage not listed explicitly in summary; designed for CTL920/CTL920F Casio compatibility)
    • intended use / compatibility:Replacement rechargeable battery for Casio watches requiring CTL920/CTL920F
    • packaging / pack quantity:Single battery included (1 x CTL920F per package)
    • manufacturer / brand:Zhongshan Juyu Yunxing Technology Co., Ltd
    • suitability for watches:Specifically a watch replacement battery for Casio (solar rechargeable)
    • Additional Feature:Rechargeable solar cell
    • Additional Feature:UL/CE/RoHS certified
    • Additional Feature:Charges in 3–5 hours

Factors to Consider When Choosing a Battery For Omega Seamaster

When choosing a battery for your Omega Seamaster, you’ll need to check battery chemistry, voltage compatibility, and physical dimensions to guarantee a proper fit. Don’t forget to match the battery to your watch’s movement requirements, since quartz, automatic with backup cells, and hybrid movements have different needs. Finally, decide whether a rechargeable or non-rechargeable cell suits your usage and service preferences.

Battery Chemistry Type

Why pick silver‑oxide chemistry for your Seamaster? You’ll get a stable voltage output that preserves the watch’s timekeeping accuracy—silver‑oxide maintains near‑constant voltage through most of its life, unlike alkaline or zinc‑air cells that can cause sudden drift. These cells deliver higher energy density and longer shelf life than same‑size alkalines, so they run small movements more consistently. Because modern silver‑oxide batteries are mercury‑free, they avoid environmental issues while still offering predictable end‑of‑life behavior. For a submersion watch you also want minimal leakage and corrosion risk; silver‑oxide is less prone to leakage than cheap alkaline alternatives. Don’t swap in rechargeable NiMH cells unless your model is specifically designed for rechargeable charging systems.

Voltage Compatibility

Because the Seamaster’s movement expects a specific nominal voltage, you should match the replacement cell to the original (typically 1.55 V silver‑oxide) to keep timekeeping accurate and avoid damaging the module. Check your watch’s technical documentation or a replacement-cell chart to confirm the exact voltage—some Seamaster chronographs or modules tolerate different voltages. Don’t substitute rechargeable 1.2 V cells for 1.55 V silver‑oxide types; the lower voltage can cause misbehavior, intermittent operation, or loss of complications. Similarly, avoid higher‑voltage or non‑standard chemistries that can produce harmful currents or heat spikes. Should you be unsure, have a qualified watchmaker measure the movement’s recommended operating voltage and install a replacement with the specified nominal voltage and a stable discharge profile.

Physical Dimensions Fit

Matching voltage is only part of the job; you also need a battery that physically fits the Seamaster’s movement and case. Measure diameter and thickness precisely in millimeters so the cell sits without wobble or stress. Verify cell height so terminals align with spring-loaded or fixed contacts; misalignment causes poor connection. Check the battery type code (SR/CR/AG, etc.) against Omega’s spec to confirm form factor and contact placement match. Make sure the replacement clears the caseback, retaining clips, and insulators so the case closes properly and keeps its water resistance. Provided you opt for rechargeable or specialty cells, confirm external dimensions match the original to avoid interference with internal components or watch functions.

Watch Movement Requirements

Upon selecting a battery for your Omega Seamaster, start identifying the movement’s exact voltage, cell size, and chemistry so you don’t compromise timekeeping or fit. Check the nominal voltage requirement—most quartz calibers need 1.5 V silver‑oxide or 1.55 V alkaline equivalents—to keep accurate oscillation. Inspect the movement for the stamped cell model (SR series/IEC code) so diameter and height match the compartment. Verify current draw and capacity needs (mAh); high‑drain features like chronographs, backlights, or alarms demand higher capacity or silver‑oxide chemistry for longer service life. Confirm whether the movement is a rechargeable accumulator type, and in case that’s true use specified CTL/accumulators with correct charging behavior. Choose chemistry with low self‑discharge to prevent voltage sag and false low‑battery indications.

Rechargeable Vs Non‑Rechargeable

Whenever deciding between rechargeable and non‑rechargeable cells for your Omega Seamaster, weigh long‑term convenience against charging needs and service implications: primary silver‑oxide cells offer higher energy density, long shelf life, and simple swap‑outs for low‑maintenance quartz movements, while rechargeable CTL/secondary types deliver consistent voltage over many cycles but require proper charging, more careful matching to the movement’s specified voltage, and professional installation to preserve seals and avoid underperformance. Choose primary cells provided that you want straightforward, infrequent replacements and minimal risk—never attempt to recharge primaries. Opt for rechargeables only on the condition that you can maintain charging routines, confirm voltage compatibility (CTLs often ~1.2–1.5 V), and accept professional servicing to protect water resistance and performance.

Temperature And Lifespan

Considering temperature is crucial because heat and cold both shorten a watch battery’s useful life and can impair a Seamaster’s timekeeping; higher temperatures speed chemical degradation and self-discharge, while cold can temporarily drop output voltage and cause intermittent stopping. You should aim to keep the watch near 20–25°C for accurate quartz performance and ideal battery life. Keep in mind operating ranges for button cells are about −10°C to +60°C, and each 1°C rise roughly doubles some degradation reaction rates, so hot environments will noticeably shorten service intervals. Typical button-cell runtimes at room temperature run 1–3 years depending on movement drain and features. Store spare cells cool and dry, ideally below 15°C, to minimize self-discharge and preserve capacity until you install them.

Manufacturer Authenticity

How can you be sure a replacement cell for your Seamaster is genuine? Check that the battery comes from a reputable manufacturer with traceable production records and declared compliance with ISO/IEC standards. Inspect the cell and packaging for clear chemistry codes, voltage ratings, and lot or batch numbers you can cross‑check against manufacturer documentation. Verify the supplier offers verifiable warranty terms, a return policy, and contactable technical support—signs of legitimate backing. Look for third‑party test reports or certification labels (RoHS, CE) and independent lab results to validate performance and safety claims. Be wary of unusually low prices, inconsistent labeling, or packaging without tamper‑evident features; these are common red flags for counterfeit or repackaged batteries.

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