Energizer Silver Oxide Coin Cell Batteries (393)

The Energizer 393 is a silver oxide coin cell, a small round battery with the 393 code and a plus mark pressed into its positive face so you can seat it the right way up first time. Silver oxide is the chemistry used where a steady voltage matters more than raw capacity: it holds a nominal 1.55V across most of its working life rather than sagging gradually, which keeps a quartz movement or a small display running at the same rate until the cell is genuinely finished. This listing is priced and sold per cell.

Coin cells in this format power the things that are too small to take a cylindrical battery: analogue quartz watches, small clocks and timers, calculators, digital thermometers, key fobs, laser pointers and kitchen scales. The number is the only reliable way to tell what a device takes, so lift the old cell out and read the figure on its face, or check the battery number in the instruction leaflet, before ordering. A cell of a different diameter or height will either refuse to sit in the holder or fail to make contact with both terminals.

Because this listing is priced per cell, the quantity you enter is the number of cells you receive. The minimum order is 10, sold in multiples of 10, which suits a repair bench, a workshop drawer or a technician keeping spares for several devices rather than one watch. The manufacturer does not print a shelf life figure on the pack. It sits with our other Energizer cells, including lithium coin batteries such as the CR1216, CR1220 and CR2032, and alkaline coin cells in LR44 and LR54.

How many cells do I actually receive?

One cell per unit. The minimum order is 10 units, sold in multiples of 10, so the smallest purchase brings you 10 separate cells.

How do I check my device takes a 393?

Read the number stamped on the face of the cell you are replacing, or look up the battery number printed in the device instruction leaflet before you order.

Can I fit a 3V lithium coin cell instead?

No. Lithium coin cells run at a nominal 3V and silver oxide cells at a nominal 1.55V, so the two are not interchangeable in the same holder.

Why choose silver oxide rather than alkaline for a watch?

Silver oxide keeps its voltage steady for most of its life, which suits timekeeping and small displays, where a gradually falling voltage changes how the device behaves.

Does the manufacturer state a shelf life for this cell?

No shelf life figure is printed on the retail pack, so we quote none here. The chemistry, voltage and code are the figures we can confirm.