Duracell 371/370 SR920W Silver Oxide Button Cell Battery 1.55V

The Duracell 371/370 SR920W is a silver oxide button cell battery rated at 1.55V with a 40mAh capacity. This SR920 chemistry battery provides stable voltage discharge across its lifespan, making it suitable for precision timing devices including analogue watches, digital watches, calculators, medical instruments, and small keychain electronics that require consistent power delivery.

The battery fits devices specifying 371, 370, SR920W, SR920, SR69, V371, or V370 button cells. Silver oxide chemistry holds voltage more consistently than alkaline equivalents as the cell depletes, which matters in watches and medical devices where accurate timing or measurement depends on stable power. The 371/370 designation indicates cross-compatibility between slightly different versions of the same physical size.

Duracell constructs this cell with mercury-free materials and designs it to resist leakage across the temperature range of -10°C to 60°C. The cell weighs 0.02kg and measures 9.5mm diameter by 2.05mm height. The sealed construction prevents silver oxide paste from escaping even when the battery is fully depleted, reducing the risk of corrosion damage to the device's battery compartment.

What devices use a 371/370 battery?

The 371/370 SR920W powers analogue and digital watches, small calculators, medical devices such as glucose meters and digital thermometers, keychain LED torches, and laser pointers. Check your device's battery compartment or manual for compatibility with SR920, 371, 370, V371 or V370 designations.

How does silver oxide differ from alkaline button cells?

Silver oxide cells maintain a flatter voltage discharge curve as they deplete, providing more consistent power throughout their lifespan. This makes them better suited to watches and medical instruments where voltage stability matters. Alkaline button cells are cheaper but their voltage drops more noticeably as the cell ages.

What is the shelf life?

Duracell silver oxide button cells typically maintain 90% or more of their capacity for 3-5 years when stored at room temperature in their original packaging. Avoid storing in high humidity or extreme temperatures to maximise shelf life.

Can this replace a 370 or SR920 battery?

Yes. The 371/370 designation indicates this battery is compatible with devices specifying either number. SR920W, SR920, SR69, V371 and V370 are alternative codes for the same physical size and voltage, with minor differences in manufacturer or specific chemistry formulation that do not affect compatibility in most consumer devices.