371 (SR920SW) and 364 (SR621SW) / 377 (SR626SW) / SR626 share similar diameters but differ in thickness and capacity: 371 (SR920SW) is 9.5 mm × 2.1 mm at 1.55V with 38 mAh.
The holder decides: use exactly the size that closes freely — forcing a thicker or thinner cell damages both battery and device.
Both are available on our model pages with individual packing data; for a mixed assortment quote, contact our team.
