So, when you need to stock up on batteries, we recommend getting one of our top picks. Our best overall rechargeable battery choice is the Panasonic ... and available in AA and AAA models.

Panasonic will be showing a ‘pin’-style Li-ion cell at Electronica, claiming it to be the “smallest cylindrical lithium-ion rechargeable battery.” Called CG-320A, it is 3.65mm in diameter and 20mm ...