AAA batteries

AAA

— "Mini-finger" or "little finger", a smaller analogue of "finger" AA — diameter is 11 mm, length — 44 mm. Produced for cases where full-size AA elements would be too bulky, and a lot of energy is not required — in particular, they are popular in remote controls, and come across in ultra-compact cameras. The nominal voltage is 1.2 V. And, as it should be with batteries, they can be recharged.