Energizer 357/303 Silver Oxide Coin Cell Battery

This is a single silver oxide coin cell carrying two reference numbers, 357 and 303, both printed on the front of the pack. The pack states 1.55V, which is the working voltage silver oxide chemistry gives and the figure a watch or meter maker quotes when it specifies this cell. It arrives on a one-cell blister card, so what you receive is one battery rather than a strip. The two numbers matter more than the brand on a replacement job: an old cell stamped 357 and an old cell stamped 303 are the same cell.

Coin cells in this family are chosen for small, low-drain devices where there is no room for a cylindrical battery and where the voltage needs to stay steady rather than sag as the cell empties: analogue watches, pocket calculators, digital thermometers, key fobs and test meters are all common homes for one. The surest way to buy the right cell is to lift the old one out and read the code stamped on its face, or check the number moulded into the battery hatch. Diameter and height vary between coin cell families, so a cell that looks similar will not always seat and make proper contact.

Silver oxide cells are primary cells, so they are used once and then recycled rather than recharged; most supermarkets and household waste sites take them at a battery collection point. Button cells of any chemistry are a swallowing hazard, so keep the card out of reach of young children and dispose of spent cells promptly. One cell is what this listing supplies, with a minimum order of 10 and multiples of 10 after that. It sits alongside our wider range of Energizer cells, from lithium coin cells such as CR2032 and CR1620 to alkaline LR44 and the everyday AA, AAA, C, D and 9V sizes.

Is a 357 the same cell as a 303?

Yes. Both numbers are printed on this pack and refer to the same silver oxide coin cell, so a device that calls for either code takes this one.

What voltage does this cell give?

The pack states 1.55V. That is the nominal voltage of silver oxide chemistry, and it is the figure most watch, meter and small instrument makers quote.

How many batteries do I receive, and what is the minimum order?

One cell per pack. The minimum order on this listing is 10, sold in multiples of 10, so the smallest purchase brings you ten single cells.

Can this cell be recharged?

No. Silver oxide coin cells are primary cells, made to be used once. Charging a primary cell risks leakage or venting, so replace it rather than recharge it.

How do I check that my device takes this cell?

Take the old cell out and read the code stamped on its face, or check the number moulded inside the battery hatch, before you order a replacement.

Why choose silver oxide over an alkaline cell of similar shape?

Silver oxide holds a steadier voltage across most of its working life, which suits watches, meters and anything that measures rather than simply runs.