LR521 and LR43 / LR44 / 23A / 27A share similar diameters but differ in thickness and capacity: LR521 is 5.8 mm × 2.1 mm at 1.5V with 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.
