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Duracell 395/399 Silver Oxide Button Cell Battery (1 Pack)

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

The Duracell 395/399 is a 1.5V silver oxide button cell battery compatible with SR927W, V395, V399 and SR57 codes. Silver oxide chemistry delivers stable voltage output across the battery's life, making it suitable for precision electronics where voltage stability matters more than alkaline alternatives. The button form factor measures approximately 9.5mm diameter by 2.7mm height.

Designed for watches, calculators, medical devices (glucose meters, thermometers), small remote controls and keyless entry fobs, the 395/399 suits low-to-moderate drain applications that need consistent performance over months rather than high-current bursts. Silver oxide chemistry operates across a wider temperature range than alkaline button cells, from -10°C to +60°C, and maintains shelf life at room temperature for several years when stored in the original blister pack.

Each battery weighs 0.02kg and ships in a single-cell blister pack with tamper-evident sealing. The silver oxide composition provides 50-80mAh capacity depending on load, giving watch applications 2-4 years of runtime and calculator applications 1-2 years depending on use frequency. Duracell silver oxide cells are mercury-free and meet EU battery directives for safe disposal with household waste in the UK.

Specification
Weight (KG) 0.02
Battery Range Duracell Specialist
Cell Size 395
Cell Composition Silver Oxide
Frequently Asked

What devices use a 395/399 battery?

The 395/399 fits watches (particularly analogue and digital-analogue hybrids), calculators, small medical devices like glucose meters and thermometers, keyless entry fobs, and some small remote controls. Check your device's battery compartment or manual for the SR927W, V395, V399 or SR57 code to confirm compatibility.

What's the difference between 395 and 399?

They are the same physical battery with different manufacturer code conventions. Duracell labels it 395/399 to indicate cross-compatibility. Other equivalent codes include SR927W (IEC standard), V395 and V399 (Varta/Panasonic), and SR57 (older Seiko code).

How long does a 395/399 battery last?

In a typical analogue watch the battery lasts 2-4 years. In a calculator with occasional use, 1-2 years. In a digital thermometer with frequent use, 6-12 months. Runtime depends on the device's current draw and how often it's used.

Can I use alkaline button cells instead?

Alkaline button cells of similar size (LR927, AG7) fit physically but silver oxide delivers more stable voltage and longer runtime in precision devices. Watches and medical instruments perform better with silver oxide chemistry.

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 Duracell 395/399 is a 1.5V silver oxide button cell battery compatible with SR927W, V395, V399 and SR57 codes. Silver oxide chemistry delivers stable voltage output across the battery's life, making it suitable for precision electronics where voltage stability matters more than alkaline alternatives. The button form factor measures approximately 9.5mm diameter by 2.7mm height.

    Designed for watches, calculators, medical devices (glucose meters, thermometers), small remote controls and keyless entry fobs, the 395/399 suits low-to-moderate drain applications that need consistent performance over months rather than high-current bursts. Silver oxide chemistry operates across a wider temperature range than alkaline button cells, from -10°C to +60°C, and maintains shelf life at room temperature for several years when stored in the original blister pack.

    Each battery weighs 0.02kg and ships in a single-cell blister pack with tamper-evident sealing. The silver oxide composition provides 50-80mAh capacity depending on load, giving watch applications 2-4 years of runtime and calculator applications 1-2 years depending on use frequency. Duracell silver oxide cells are mercury-free and meet EU battery directives for safe disposal with household waste in the UK.

    Specification
    Weight (KG) 0.02
    Battery Range Duracell Specialist
    Cell Size 395
    Cell Composition Silver Oxide
    Frequently Asked

    What devices use a 395/399 battery?

    The 395/399 fits watches (particularly analogue and digital-analogue hybrids), calculators, small medical devices like glucose meters and thermometers, keyless entry fobs, and some small remote controls. Check your device's battery compartment or manual for the SR927W, V395, V399 or SR57 code to confirm compatibility.

    What's the difference between 395 and 399?

    They are the same physical battery with different manufacturer code conventions. Duracell labels it 395/399 to indicate cross-compatibility. Other equivalent codes include SR927W (IEC standard), V395 and V399 (Varta/Panasonic), and SR57 (older Seiko code).

    How long does a 395/399 battery last?

    In a typical analogue watch the battery lasts 2-4 years. In a calculator with occasional use, 1-2 years. In a digital thermometer with frequent use, 6-12 months. Runtime depends on the device's current draw and how often it's used.

    Can I use alkaline button cells instead?

    Alkaline button cells of similar size (LR927, AG7) fit physically but silver oxide delivers more stable voltage and longer runtime in precision devices. Watches and medical instruments perform better with silver oxide chemistry.

    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.