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Canonical battery record · checked 2 September 2026

SR44SW / 303

The SR44SW / 303 silver-oxide family is 11.6 × 5.4 mm. Preserve the W/SW drain designation unless current device or manufacturer guidance permits otherwise.

SR44SW303V303
Answer

SR44SW, 303, V303 are the supported exact aliases for one 11.6 × 5.4 mm silver-oxide watch cell. No other family is treated as an automatic replacement.

Top profile · Ø 11.6 mm
Side profile · 5.4 mm high
Original proportional profiles. Scale is consistent within this diagram; screen size is not a physical ruler.
Format
Silver-oxide watch cell
Dimensions
11.6 × 5.4 mm
Voltage
1.55 V nominal
Chemistry
Silver oxide / zinc
Drain context
SW: low-drain profile
Rechargeable?
No — primary cell; do not recharge.
Capacity context
Manufacturer- and test-condition-specific; no universal capacity is asserted from the selection guide.
Confidence
High

Equivalence and confusion matrix

Code or familyClassificationReason
SR44SW · 303 · V303Exact equivalentThese evidence-backed markings resolve to this one canonical record and share its cited physical and electrical specification.
LR44 / A76 / AG13Same size, different electrical familyThe 11.6 × 5.4 mm envelope matches, but the electrical families do not: Silver oxide / zinc at 1.55 V nominal versus Alkaline manganese dioxide / zinc at 1.5 V nominal. Physical fit is not equivalence.
SR44W / 357Conditional substituteBoth are 11.6 × 5.4 mm silver oxide / zinc cells at 1.55 V nominal, but their drain designations differ (SW: low-drain profile versus W: higher-drain profile). Preserve the device-specified class.
PR44 / size 675Same size, different electrical familyThe 11.6 × 5.4 mm envelope matches, but the electrical families do not: Silver oxide / zinc at 1.55 V nominal versus Zinc-air at 1.4 V nominal. Physical fit is not equivalence.
LR43 / AG12Not equivalentThe physical envelopes differ (11.6 × 5.4 mm versus 11.6 × 4.2 mm). Do not force, stack or infer equivalence from a shared diameter or code pattern.

Supported application context

  • Watches specifying this exact code and drain class

Application context is limited to the scope stated in Murata Watch Battery Selection Guide; it is not a device compatibility claim.

This record belongs to the watch-cell system. Maker numbers are useful aliases, while the SW low-drain designation remains part of device selection.

SR44SW/303 is the low-drain silver-oxide member of the 11.6 × 5.4 mm cluster. SR44W/357 shares its envelope and chemistry but retains the higher-drain W designation; LR44 and PR44 change chemistry.

What the code means

SR44SW identifies a silver-oxide watch cell. The W or SW suffix is part of the supported identity and records the manufacturer drain class.

Discharge and drain behaviour

Silver-oxide cells are selected for a comparatively stable working voltage. SW: low-drain profile remains material in watch applications, so a shared diameter and height do not erase the W/SW distinction.

Capacity context: Manufacturer- and test-condition-specific; no universal capacity is asserted from the selection guide.

Substitution guidance

Treat only the aliases on this page as exact equivalents. Another cell with the same dimensions is conditional at best unless its chemistry, nominal voltage and low-drain requirement also agree with the device specification.

Fact-level evidence

Murata Watch Battery Selection Guide

Published by Murata; page 1, SR44SW dimension and cross-reference row. Checked 2 September 2026. Independently presented facts only; publisher wording, layout and diagrams are not reproduced.

Corroborated against Maxell Button and Coin Battery Cross-reference Table; SR44SW row in the silver-oxide battery table.

Open primary source Open corroborating source
Not a device-fit guarantee.

Confirm the exact code, chemistry and drain requirement with the device maker. Keep button and coin cells away from children and never recharge this primary cell.