Use a CR2032 battery or be prepared for a life of misery. :) To a first, second, and third approximation: CR2032 is the largest coin cell that exists. Anythi

Use a CR2032 battery or be prepared for a life of misery. :) To a first, second, and third approximation: CR2032 is the largest coin cell that exists. Anything else has terribly weird quirks and may not actually be better than a CR2032. Basically, there are only three battery choices: 1) Alkaline 2) CR2032 3) Full blown LiPol rechargeable Any divergence is pain. Lots and lots of pain.