Varta Varta SR41 Button Battery, 1.55V, 7.9mm Diameter Part: 20384903501

Tiny silver oxide button battery for watches, calculators and hearing aids.

Murata Murata SR41 Button Battery, 1.5V, 7.9mm Diameter Part: 97384004 LR41/8MR1WW

Tiny alkaline button battery for watches, scales and toy devices.

RS PRO RS PRO SR41 Button Battery, 1.55V, 7.9mm Diameter Part: 593-401

Tiny silver oxide button cell for wristwatches and miniature electronic instruments.