1.5 V that sags as it drains. Fine for toys and lights; a poor watch substitute.
LR43 · 11.6 × 4.2 mm
LR44 · 11.6 × 5.4 mm
LR1130 · 11.6 × 3 mm
LR1120 · 11.6 × 2.1 mm
LR41 · 7.9 × 3.6 mm