Watch Battery Equivalents & Size Guide
Wrist watches usually need silver oxide cells for stable 1.55V timing. Alkaline labels (LR/AG) fit the same holders but sag sooner under load. Match diameter × height first, then prefer SR/377-style chemistry for quartz movements.
Selection notes
- Measure the old cell or read the movement chart — 6.8 × 2.6 mm (377) is not the same as 6.8 × 2.1 mm (364).
- Prefer silver oxide (SR) over alkaline (LR) for accuracy and longer service intervals.
- High-drain vs low-drain labels (e.g. 357 vs 303) matter for chronographs and light modules.
Related charts
SR626SW (sold as 377 or 376) is a standard silver oxide watch battery at 6.8 × 2.6 mm, 1.55V. It is one of the most common quartz watch cells — do not confuse with the thinner 364/SR621SW.
SR920SW, commonly sold as 371, is a 9.5 × 2.1 mm silver oxide watch cell. Do not confuse it with 377/SR626SW, which measures 6.8 × 2.6 mm and will not fit the same battery seat.
SR621SW (364) is a thin 6.8 × 2.1 mm silver oxide watch cell — do not confuse with the taller 2.6 mm 377/SR626SW.
L736 is a high-intent search label for the 7.9 × 3.6 mm alkaline button cell also sold as LR41 or AG3. Watch makers often specify the silver oxide twin (SR41/392/SR736SW) instead.
SR44 silver oxide cells (also sold as 357 or 303) provide stable 1.55V output in the standard LR44 form factor.
357 is the most common US retail label for SR44-size silver oxide watch batteries.
LR41 (AG3/L736) is a compact 7.9 × 3.6 mm alkaline button cell — much smaller than LR44.
SR41 (392/384) is the silver oxide upgrade for the LR41/L736/AG3 size — stable 1.55V in a 7.9 × 3.6 mm package.
Frequently Asked Questions
Can I put an alkaline cell in a watch that came with silver oxide?
It often fits, but voltage sag can make the watch run slow or stop early. Silver oxide is the better long-term choice for quartz watches.
Is 377 the same as SR626SW?
Yes for shopping purposes. 377 is the common US label for the SR626SW silver oxide cell (6.8 × 2.6 mm). Do not confuse it with thinner 364/SR621SW.
What is the difference between 377 and 364 watch batteries?
Both are 6.8 mm wide. 377/SR626SW is 2.6 mm thick; 364/SR621SW is 2.1 mm thick. Using the wrong height causes poor contact or a caseback that will not close.
Can I use LR44 in a watch instead of 357?
LR44/AG13 often fits the same holder as 357/SR44, but alkaline voltage sag is worse for timekeeping. Prefer silver oxide 357 for watches.
Review record and primary sources
Reviewed by PlainBattery Technical Review Desk on 2026-08-25. Checked: device-selection guidance, linked battery dimensions, voltage, and chemistry, compatibility and safety limits.
- Silver Oxide (SR) and Alkaline Button (LR) Battery Specifications — Maxell. SR/LR model dimensions, voltage, nominal capacity and drain class.
- Energizer 357/303 / IEC SR44 Product Datasheet — Energizer Holdings, EBC-4349C. SR44/357/303 dimensions, chemistry, voltage and low-drain performance.
Revision record: source citations and field-level review scope added September 11, 2026. See our sources and methodology and corrections policy.
To identify a printed code, use the Battery Finder or the cross-reference charts.