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Energizer 394/380 Silver Oxide Button Cell Batteries - 10 Pack

£199
The RRP is the manufacturer's recommended retail price of the item.
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Description

The Energizer 394/380 is a silver oxide button cell battery delivering 1.55V stable voltage for watches, key fobs, calculators and compact medical devices. Silver oxide chemistry provides consistent power output across the discharge curve, unlike alkaline alternatives that show gradual voltage decline. Each pack contains 10 individual cells measuring 9.5mm diameter by 3.6mm height.

Designed for devices requiring reliable, long-term power in a compact form factor, the 394/380 suits watch movements, glucose monitors, hearing aids, car key remotes and small electronic toys. The leak-resistant construction protects sensitive electronics from corrosion damage during the battery's operational life and shelf storage. Energizer rates these cells for up to 5 years shelf life when stored at room temperature.

The 394/380 designation refers to two interchangeable reference codes for the same cell size — SR936SW in IEC nomenclature, also sold as SR45 or AG9 by other manufacturers. The dual naming on Energizer packaging confirms compatibility with devices specifying either 394 or 380 in their battery compartment. The silver oxide composition delivers approximately 30% more capacity than equivalent alkaline button cells of the same size.

Specification
Weight (KG) 0.01
Width (mm) 5
Height (mm) 24
Depth (mm) 24
Battery Range Energizer Specialist
Cell Size 394
Cell Composition Silver Oxide
Frequently Asked

What devices use 394/380 batteries?

The 394/380 is commonly used in analogue and digital watches, car key fobs, small calculators, glucose meters, hearing aids, laser pointers and LED keyrings. Check your device's battery compartment or manual for confirmation — it may list 394, 380, SR936SW, SR45 or AG9 as compatible designations.

Are 394 and 380 batteries the same?

Yes. 394 and 380 are two manufacturer reference codes for the same physical cell size and voltage. Energizer labels this cell as 394/380 to confirm it replaces either designation. The IEC standard code is SR936SW.

How long do silver oxide button cells last?

Operating life depends on the device's power draw. In a typical analogue watch the 394/380 lasts 2-3 years. In devices with higher current draw like LED torches or active key fobs, expect 6-18 months. Shelf life is up to 5 years when stored at room temperature.

Can I use alkaline button cells instead?

Alkaline button cells in the same size (LR936, AG9) will physically fit but deliver lower voltage stability and approximately 30% less capacity. Watches and medical devices designed for silver oxide may show timing errors or early low-battery warnings if alkaline cells are substituted.

Shipping & Returns

Free worldwide delivery

Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

Returns

30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.

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    Description

    The Energizer 394/380 is a silver oxide button cell battery delivering 1.55V stable voltage for watches, key fobs, calculators and compact medical devices. Silver oxide chemistry provides consistent power output across the discharge curve, unlike alkaline alternatives that show gradual voltage decline. Each pack contains 10 individual cells measuring 9.5mm diameter by 3.6mm height.

    Designed for devices requiring reliable, long-term power in a compact form factor, the 394/380 suits watch movements, glucose monitors, hearing aids, car key remotes and small electronic toys. The leak-resistant construction protects sensitive electronics from corrosion damage during the battery's operational life and shelf storage. Energizer rates these cells for up to 5 years shelf life when stored at room temperature.

    The 394/380 designation refers to two interchangeable reference codes for the same cell size — SR936SW in IEC nomenclature, also sold as SR45 or AG9 by other manufacturers. The dual naming on Energizer packaging confirms compatibility with devices specifying either 394 or 380 in their battery compartment. The silver oxide composition delivers approximately 30% more capacity than equivalent alkaline button cells of the same size.

    Specification
    Weight (KG) 0.01
    Width (mm) 5
    Height (mm) 24
    Depth (mm) 24
    Battery Range Energizer Specialist
    Cell Size 394
    Cell Composition Silver Oxide
    Frequently Asked

    What devices use 394/380 batteries?

    The 394/380 is commonly used in analogue and digital watches, car key fobs, small calculators, glucose meters, hearing aids, laser pointers and LED keyrings. Check your device's battery compartment or manual for confirmation — it may list 394, 380, SR936SW, SR45 or AG9 as compatible designations.

    Are 394 and 380 batteries the same?

    Yes. 394 and 380 are two manufacturer reference codes for the same physical cell size and voltage. Energizer labels this cell as 394/380 to confirm it replaces either designation. The IEC standard code is SR936SW.

    How long do silver oxide button cells last?

    Operating life depends on the device's power draw. In a typical analogue watch the 394/380 lasts 2-3 years. In devices with higher current draw like LED torches or active key fobs, expect 6-18 months. Shelf life is up to 5 years when stored at room temperature.

    Can I use alkaline button cells instead?

    Alkaline button cells in the same size (LR936, AG9) will physically fit but deliver lower voltage stability and approximately 30% less capacity. Watches and medical devices designed for silver oxide may show timing errors or early low-battery warnings if alkaline cells are substituted.

    Shipping & Returns

    Free worldwide delivery

    Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

    Returns

    30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.