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Button cell battery cross-reference chart

Each row is one physical size. Codes on the same row fit the same device: the silver oxide SR cell (with its three-digit number such as 377) and the cheaper alkaline LR / AG cell. Silver oxide is the better choice for watches and anything precise.

Silver oxide	Number code	Alkaline	Diameter	Height	Capacity (SR)
SR416SW	337	–	4.8 mm	1.65 mm	≈ 8 mAh
SR516SW	317	–	5.8 mm	1.65 mm	≈ 11 mAh
SR521SW	379	LR521 / AG0	5.8 mm	2.15 mm	≈ 14 mAh
SR527SW	319	–	5.8 mm	2.7 mm	≈ 18 mAh
SR616SW	321	–	6.8 mm	1.65 mm	≈ 14 mAh
SR621SW	364 / 363	LR621 / AG1	6.8 mm	2.15 mm	≈ 23 mAh
SR626SW	377 / 376 / 177	LR626 / AG4	6.8 mm	2.6 mm	≈ 28 mAh
SR712SW	346	–	7.9 mm	1.25 mm	≈ 10 mAh
SR716SW	315	–	7.9 mm	1.65 mm	≈ 19 mAh
SR721SW	362 / 361	LR721 / AG11	7.9 mm	2.1 mm	≈ 25 mAh
SR726SW	397 / 396	LR726 / AG2	7.9 mm	2.6 mm	≈ 32 mAh
SR731SW	329	–	7.9 mm	3.1 mm	≈ 36 mAh
SR41	392 / 384	LR41 / AG3	7.9 mm	3.6 mm	≈ 45 mAh
SR48	393 / 309	LR754 / AG5	7.9 mm	5.4 mm	≈ 75 mAh
SR916SW	373	–	9.5 mm	1.6 mm	≈ 26 mAh
SR920SW	371 / 370	LR920 / AG6	9.5 mm	2.05 mm	≈ 40 mAh
SR927SW	395 / 399	LR927 / AG7	9.5 mm	2.7 mm	≈ 55 mAh
SR936SW	394 / 380	LR936 / AG9	9.5 mm	3.6 mm	≈ 70 mAh
SR1120SW	381 / 391	LR1120 / AG8	11.6 mm	2.05 mm	≈ 45 mAh
SR1130SW	390 / 389	LR1130 / AG10	11.6 mm	3.05 mm	≈ 80 mAh
SR1136SW	344 / 350	–	11.6 mm	3.6 mm	≈ 100 mAh
SR43	386 / 301	LR43 / AG12	11.6 mm	4.2 mm	≈ 120 mAh
SR44	357 / 303	LR44 / AG13	11.6 mm	5.4 mm	≈ 170 mAh

How button cell codes work

SR = silver oxide (1.55 V), LR = alkaline (1.5 V); the digits after SR or LR give diameter and height (SR626 = 6.8 mm × 2.6 mm). SW on the end means low drain (analog watches) and W high drain (digital watches with lights and alarms). AG numbers are an alkaline shorthand: AG13 is the LR44, AG4 the LR626. Three-digit codes (377, 364, 357) are the Energizer / Renata style names for the silver oxide cells.

The single most common watch battery is the 377 (SR626SW); the most common calculator and toy cell is the LR44.