About CoinCellChart

Coin and button cells go by several names at once — an IEC code, a maker’s own number, a watch-battery number — and the answer to “which one fits?” is usually buried in a datasheet or a car manual. CoinCellChart pulls those answers into one place.

We read two kinds of first-hand source: battery makers’ datasheets and cross-reference lists, and carmakers’ owner’s manuals. Every value on the site links to where it came from and says when we checked it. A cell is called an equivalent only when a battery maker lists it as one; two cells that merely share a size are shown as the same size, not as interchangeable. When sources give different answers, we show both.

We don’t sell batteries, we have no shop or affiliate links, and we don’t accept payment to list anything. We don’t reproduce replacement instructions; each key fob row points to the manual page that has them.

CoinCellChart is independent. It is not affiliated with, endorsed by, or operated on behalf of Energizer, Duracell, Panasonic, Renata, Maxell, Murata, Toshiba, Varta, Rayovac, Timex, Citizen, Seiko, Toyota, Honda, Nissan, Subaru, Ford, or any other company named on the site. Brand names are used only to identify a battery or a vehicle.

See the method page for the full rules. Corrections and questions: hello@coincellchart.com.