These are primarily non-rechargeable alkaline batteries that have been used for decades. The standardized cell sizes are AAAA, AAA, AA, C and D, as well as button and coin cells and many others.

HEART surgeons have implanted one of the smallest pacemakers ever — roughly the size of a AAA battery. Graham Motteram, 76, was fitted with the tiny tech in a 30-minute op . 3 ...

Slate senior editor Andy Bowers explains why we only see standard-sized batteries like AA, AAA, C and D — but we no longer see larger-sized A or B cells.