Energizer 364/363 Silver Oxide Button Cell Batteries - 1.5V (10 Pack)

The Energizer 364/363 is a 1.5V silver oxide button cell battery measuring 6.8mm diameter by 2.1mm height, designed for compact electronics requiring stable voltage output. The silver oxide chemistry maintains consistent 1.5V delivery throughout the discharge cycle, unlike alkaline button cells that experience voltage drop under load, making it the preferred choice for precision timing devices, medical instruments and digital watches.

Sold in a 10-pack, these button cells fit devices specifying either 364 or 363 cell sizes (the codes are interchangeable — 364 is the IEC designation, 363 the older industry code for the same physical cell). Common applications include wristwatches, fitness trackers, calculators, car key fobs, hearing aids, glucometers, laser pointers and small LED torches. The flat discharge curve of silver oxide chemistry means devices continue operating at full performance until the cell is depleted, rather than gradually dimming or slowing.

Each cell uses leak-resistant construction with a stainless steel case and sealing gasket to protect device internals from electrolyte damage. The 10-pack format suits households and workplaces keeping spares on hand for multiple devices, or buyers maintaining a stock for watches and medical equipment that need periodic replacement. Energizer rates these cells with a shelf life of up to 5 years when stored at room temperature, allowing packs to be kept as drawer spares without significant capacity loss.

What's the difference between 364 and 363 battery codes?

They are the same physical cell. 364 is the IEC (International Electrotechnical Commission) designation, while 363 is an older industry code. Both refer to a 6.8mm diameter × 2.1mm height silver oxide button cell at 1.5V. Devices specifying either code will accept this battery.

Can I use alkaline button cells instead of silver oxide?

Alkaline button cells in the same size (such as LR621) will physically fit but are not recommended for precision devices. Silver oxide maintains stable 1.5V output throughout discharge, while alkaline voltage drops progressively under load. Watches and medical devices calibrated for silver oxide may malfunction or display inaccurate readings with alkaline substitutes.

What devices commonly use 364/363 cells?

Analogue and digital wristwatches, fitness trackers, calculators, car key fobs with remote locking, hearing aids, glucometers, small LED torches, laser pointers, electronic calipers and some camera light meters. Check your device manual or the existing battery for confirmation.

How long do these batteries last in storage?

Energizer rates silver oxide button cells with a shelf life of up to 5 years when stored at room temperature in the original packaging. Avoid storing in high-heat locations (above 30°C) or high-humidity environments, as both accelerate self-discharge and reduce usable capacity.