Watch Battery Cross-Reference Finder

Watch batteries carry two naming systems that describe the same physical cell. The SR/LR code (like SR626SW) states the chemistry, the case size, and the drain rate. The three-digit code (like 377) is the retail/IEC-style number that brands such as Energizer, Duracell and Renata print on the pack. Add brand prefixes (D for Duracell, V for Varta/Vinnic) and the alkaline AG numbers, and one battery can appear under ten labels. They are all interchangeable when the size matches — the tool above maps every alias back to one cell.

The most common silver-oxide watch cells and their equivalents. Silver-oxide is 1.55V; the alkaline equivalent is 1.5V and shares the same dimensions.

Data compiled from published manufacturer cross-reference charts (Energizer, Renata, Duracell, Maxell). Always match the physical dimensions of your old cell if a code is unclear.

If you can't read the code on a spent battery, measure it. Diameter and height (in millimetres) uniquely identify the cell, and the chart above maps those dimensions to every code. A caliper is ideal, but even a ruler gets you close enough to distinguish, say, a 6.8mm 377 from a 9.5mm 371.

Silver-oxide (SR) — best for watches

SR cells deliver a stable 1.55V that stays flat until the battery is nearly exhausted. That constant voltage keeps quartz timekeeping accurate and gives a clean “end of life” behaviour. For any analog quartz watch, this is the right choice.

Alkaline (LR / AG) — cheaper, not ideal

LR and AG cells are the same size as their SR counterparts but start at 1.5V and their voltage sags steadily as they drain. They're fine for toys and cheap devices, but in a watch they can cause the seconds hand to run slightly off and they die sooner. Use them only as a temporary substitute.

Lithium (CR) — a different voltage

CR cells (like CR2016, CR2025, CR2032) are 3V lithium and are not interchangeable with 1.55V silver-oxide cells — they appear in some digital modules and thicker watches. Handily, the CR number encodes the size: CR2032 is 20mm across and 3.2mm tall, CR2016 is 20mm × 1.6mm. Match the CR number exactly.

Solar watches — a rechargeable cell

Solar watches (Casio Tough Solar, Citizen Eco-Drive, Seiko Solar) don't take a standard replaceable battery at all — they use a rechargeable capacitor or secondary cell charged by light. If a solar watch stops, it usually needs charging in bright light, not a new battery.

Is 377 the same as SR626SW?

Yes. 377 is the numeric code and SR626SW is the silver-oxide designation for the identical cell (6.8 × 2.6mm, 1.55V). They're the same battery; buy whichever label you find.

Does the “SW” vs “W” letter really matter?

For most analog watches, no — they're the same size and interchangeable. If your watch has a backlight, alarm, or chronograph that draws more current, the high-drain “W” version is the ideal match, but the “SW” will still work.

Can I use LR44 instead of 357?

In a pinch. They're the same size, but LR44 is alkaline (1.5V, sagging voltage) while 357 is silver-oxide (1.55V, stable). For a watch, the 357 keeps better time and lasts longer.

How long should a watch battery last?

A typical analog quartz watch runs 1–3 years on a silver-oxide cell, depending on the movement and features. Chronographs and backlit watches drain faster. If a fresh battery dies quickly, the movement may need service.