Reference dimensions are not universal manufacturing tolerances. Check the actual cell and holder.
The type status describes documentary checks of core specifications, not every fact or suitability for a device.
Understanding SR44 before replacement
Identify the actual battery
SR44 is a documented Silver oxide / zinc primary cell with a nominal voltage of 1.55 V. Its reference diameter is 11.6 mm and its reference height is 5.4 mm. These are nominal reference dimensions, not a promise that every manufacturer has identical tolerances.
This dataset describes a non-rechargeable bare cell, without solder tabs or wires. A tabbed or wired assembly requires a separate fit check.
What markings identify this type?
The dataset associates 1131SO, 357/303, SR44W, SR44SW with SR44. The manufacturer may use a different label on the package. These references help identify the type; they do not certify the battery for a particular device.
A suffix such as W or SW describes a discharge/load variant. Preserve this requirement when choosing a replacement.
Similar dimensions in this catalogue
The following types share the same reference diameter as SR44. Their height, chemistry or voltage may differ. They are comparisons, not approved substitutes:
SR44W and SR44SW identify high- and low-drain variants. The dataset also maps 357 to the high-drain label and 303 to the low-drain label; these details must not be discarded when searching for a replacement.
What to check before replacing SR44
Read the original device marking, verify nominal voltage and chemistry, compare diameter and height, and check the contacts and load requirements. Same diameter, identical voltage, or a familiar brand prefix alone is not enough to establish interchangeability.
The available data contains no affirmative device-specific fit test for SR44. A missing compatibility relation means “not assessed,” not “compatible.”
How reliable are these specifications?
Core type characteristics were compared with primary material from at least two independent publishers. This does not verify all model-specific values or physical suitability.
Not on the basis of size or matching names alone. Check the exact device requirements and the directed compatibility notes. This catalogue does not contain a guaranteed device-fit recommendation for SR44.
How does SR44 differ from LR44?
SR44 and LR44 have reference heights of 5.4 mm and 5.4 mm respectively, and nominal voltages of 1.55 V and 1.5 V. Their chemical systems are Silver oxide / zinc and Alkaline zinc / manganese dioxide. These comparisons do not establish a permitted replacement.