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Energizer 357/303 Silver Oxide Button Cell Battery - 1.55V (1 Pack)

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

The Energizer 357/303 is a 1.55V silver oxide button cell battery designed for watches, hearing aids, key fobs, calculators and medical devices that require stable voltage output. Silver oxide chemistry delivers flatter discharge curves than alkaline equivalents, maintaining consistent voltage throughout the battery's life rather than gradually declining.

The 357/303 designation indicates cross-compatibility — the same cell is sold as SR44, LR44W, AG13 and other reference codes depending on manufacturer and chemistry variant. This Energizer cell uses silver oxide rather than alkaline, giving longer runtime and more stable performance in precision devices like quartz watches and glucose monitors where voltage consistency matters. The coin format measures approximately 11.6mm diameter by 5.4mm height, fitting standard battery compartments in compact electronics.

Leak-resistant construction protects device contacts from corrosion during storage and use. The cell carries a shelf life of several years when stored at room temperature in the original blister pack, making it practical to keep spares for watches and hearing aids. Energizer rates the 357/303 at approximately 150-200mAh capacity depending on discharge rate, with higher capacity than equivalent alkaline button cells.

Specification
Weight (KG) 0.01
Battery Range Energizer Specialist
Cell Size 357
Cell Composition Silver Oxide
Frequently Asked

What devices use the 357/303 battery?

Watches, hearing aids, key fobs, calculators, glucose monitors, laser pointers and small LED torches commonly use this size. Check your device's battery compartment or manual for the required cell code — 357, 303, SR44 and AG13 all refer to the same physical size, though chemistry may vary.

What's the difference between 357 and 303?

They are the same battery. Energizer labels this cell 357/303 to indicate it meets both specification codes. The silver oxide chemistry in this cell makes it interchangeable with SR44 and other equivalent codes.

How long does it last?

Runtime depends on the device's power draw. In a quartz watch drawing microamps, expect 1-3 years. In a hearing aid drawing milliamps, expect weeks to months. Silver oxide gives longer life than alkaline in continuous-use devices.

Can I use alkaline LR44 instead?

Physically they fit the same compartment, but silver oxide (SR44/357) maintains stable 1.55V output while alkaline (LR44) starts at 1.5V and declines more quickly. For precision devices like watches and medical equipment, silver oxide is the better choice.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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    Description

    The Energizer 357/303 is a 1.55V silver oxide button cell battery designed for watches, hearing aids, key fobs, calculators and medical devices that require stable voltage output. Silver oxide chemistry delivers flatter discharge curves than alkaline equivalents, maintaining consistent voltage throughout the battery's life rather than gradually declining.

    The 357/303 designation indicates cross-compatibility — the same cell is sold as SR44, LR44W, AG13 and other reference codes depending on manufacturer and chemistry variant. This Energizer cell uses silver oxide rather than alkaline, giving longer runtime and more stable performance in precision devices like quartz watches and glucose monitors where voltage consistency matters. The coin format measures approximately 11.6mm diameter by 5.4mm height, fitting standard battery compartments in compact electronics.

    Leak-resistant construction protects device contacts from corrosion during storage and use. The cell carries a shelf life of several years when stored at room temperature in the original blister pack, making it practical to keep spares for watches and hearing aids. Energizer rates the 357/303 at approximately 150-200mAh capacity depending on discharge rate, with higher capacity than equivalent alkaline button cells.

    Specification
    Weight (KG) 0.01
    Battery Range Energizer Specialist
    Cell Size 357
    Cell Composition Silver Oxide
    Frequently Asked

    What devices use the 357/303 battery?

    Watches, hearing aids, key fobs, calculators, glucose monitors, laser pointers and small LED torches commonly use this size. Check your device's battery compartment or manual for the required cell code — 357, 303, SR44 and AG13 all refer to the same physical size, though chemistry may vary.

    What's the difference between 357 and 303?

    They are the same battery. Energizer labels this cell 357/303 to indicate it meets both specification codes. The silver oxide chemistry in this cell makes it interchangeable with SR44 and other equivalent codes.

    How long does it last?

    Runtime depends on the device's power draw. In a quartz watch drawing microamps, expect 1-3 years. In a hearing aid drawing milliamps, expect weeks to months. Silver oxide gives longer life than alkaline in continuous-use devices.

    Can I use alkaline LR44 instead?

    Physically they fit the same compartment, but silver oxide (SR44/357) maintains stable 1.55V output while alkaline (LR44) starts at 1.5V and declines more quickly. For precision devices like watches and medical equipment, silver oxide is the better choice.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.