A quartz watch battery stamped 377 can show up in a parts catalog under SR626SW. A search system needs to connect those labels while preserving the difference between SR626SW and SR626W. The suffix matters even though the cells have the same dimensions.

Renata identifies its 377 as SR626SW, a low-drain silver-oxide cell rated at 1.55 V and measuring 6.8 × 2.6 mm. Its separate sheet for 376 identifies that cell as SR626W, the high-drain part in the same size family. The sheets also show SR66, a label that by itself cannot distinguish these two records. When identifying a replacement for a specific watch, start with the battery specified for its movement. Renata 377 data sheet · Renata 376 data sheet

Find the battery for a Miyota 2035

Suppose the watch uses a Miyota 2035 and you need to check which battery to order. Start with the caliber number. Miyota's specification for the 2035 lists SR626SW in the battery field. That gives you the full designation to look for in a manufacturer's catalog. Miyota 2035 specification

A shop listing might say Renata 377 in the title. Follow the part number back to Renata's sheet and compare its designation with Miyota's. Both say SR626SW, so the 377 matches the battery specified for this movement. If another listing says 376 or only SR66, check the full designation before ordering. Renata's 376 sheet says SR626W, and SR66 appears on both sheets.

That gives a parts lookup two useful starting points. Someone holding the old cell can search for 377 and resolve it to SR626SW. Someone who knows the caliber can start with the movement specification and work back to 377 as a manufacturer's part number. In both cases the full designation is the join between the two records.

Normalize the input and keep the suffix

Trimming whitespace and folding case help the search accept real input without changing the designation. A shared label should return candidates so the reader can compare the records. This small fixture models only the two Renata cells above.

const labels = new Map([ ["377", ["SR626SW"]], ["SR626SW", ["SR626SW"]], ["376", ["SR626W"]], ["SR626W", ["SR626W"]], ["SR66", ["SR626SW", "SR626W"]], ]) const lookup = input => labels.get(input.trim().toUpperCase()) ?? [] console.log(lookup(" 377 ").join(", ")) // SR626SW console.log(lookup("sr626w").join(", ")) // SR626W console.log(lookup("SR66").join(", ")) // SR626SW, SR626W

A catalog entry can make this check easier by showing the printed designations, load class, and manufacturer source together. Watch the Details cross-reference for 377